diff --git a/src/dsd_audio2.c b/src/dsd_audio2.c
index a836afc..5eaf3c4 100644
--- a/src/dsd_audio2.c
+++ b/src/dsd_audio2.c
@@ -906,8 +906,31 @@ void playSynthesizedVoiceSS3 (dsd_opts * opts, dsd_state * state)
   //CHEAT: Using the slot on/off, use that to set encL or encR back on
   //as a simple way to turn off voice synthesis in a particular slot
   //its not really 'disabled', we just aren't playing it
-  if (opts->slot1_on == 0) encL = 1;
-  if (opts->slot2_on == 0) encR = 1;
+  // if (opts->slot1_on == 0) encL = 1;
+  // if (opts->slot2_on == 0) encR = 1;
+
+  //this may have some unintended side effects that I haven't tested/explored yet, that's why its a patch only
+  //particularly in regards to 'Aero' Builds with their OSS Jank and slot_preference = 3 by default
+  //if rounds of testing in various scenaries looks good, I may expand this to P25p2 and the Float Variants as well
+  if (opts->slot1_on == 0 && opts->slot2_on == 1 && encR == 0) //slot 1 is hard off and slot 2 is on
+    memcpy (state->s_l4, state->s_r4, sizeof(state->s_l4)); //copy right to left
+  else if (opts->slot1_on == 1 && opts->slot2_on == 0 && encL == 0) //slot 2 is hard off and slot 1 is on
+    memcpy (state->s_r4, state->s_l4, sizeof(state->s_r4)); //copy left to right
+  else if (opts->slot_preference == 0 && state->dmrburstL == 16 && encL == 0) //slot 1 is preferred, and voice in slot 1
+    memcpy (state->s_r4, state->s_l4, sizeof(state->s_r4)); //copy left to right
+  else if (opts->slot_preference == 1 && state->dmrburstR == 16 && encR == 0) //slot 2 is preferred, and voice in slot 2
+    memcpy (state->s_l4, state->s_r4, sizeof(state->s_l4)); //copy right to left
+  else if (state->dmrburstL == 16 && state->dmrburstR != 16 && encL == 0) //voice in left, no voice in right
+    memcpy (state->s_r4, state->s_l4, sizeof(state->s_r4)); //copy left to right
+  else if (state->dmrburstR == 16 && state->dmrburstL != 16 && encR == 0) //voice in right, no voice in left
+    memcpy (state->s_l4, state->s_r4, sizeof(state->s_l4)); //copy right to left
+  //else if voice in both, and both slots on, and no preference on slot, then regular stereo interleave (left and right channels)
+
+  if (opts->slot1_on == 0 && opts->slot2_on == 0) //both slots are hard off, disable playback
+  {
+    encL = 1;
+    encR = 1;
+  }
 
   //WIP: Mute if on B list (or not W list)
   char modeL[8];
@@ -944,12 +967,37 @@ void playSynthesizedVoiceSS3 (dsd_opts * opts, dsd_state * state)
   if (strcmp(modeL, "B") == 0) encL = 1;
   if (strcmp(modeR, "B") == 0) encR = 1;
 
+  //check to see if we need to enable slot and toggle slot preference here
+  //this method will always favor slot 2 (this is a patch anyways, so....meh)
+  if (strcmp(modeL, "A") == 0)
+  {
+    opts->slot1_on = 1;
+    opts->slot_preference = 0;
+  }
+  if (strcmp(modeR, "A") == 0)
+  {
+    opts->slot2_on = 1;
+    opts->slot_preference = 1;
+  }
+
   //if TG Hold in place, mute anything but that TG #132
-  if (state->tg_hold != 0 && state->tg_hold != TGL) encL = 1;
-  if (state->tg_hold != 0 && state->tg_hold != TGR) encR = 1;
-  //likewise, override and unmute if TG hold matches TG
-  if (state->tg_hold != 0 && state->tg_hold == TGL) encL = 0;
-  if (state->tg_hold != 0 && state->tg_hold == TGR) encR = 0;
+  if (state->tg_hold != 0 && state->tg_hold != TGL) 
+    encL = 1;
+  if (state->tg_hold != 0 && state->tg_hold != TGR)
+    encR = 1;
+  //likewise, override and unmute if TG hold matches TG (and turn on slot and set preference)
+  if (state->tg_hold != 0 && state->tg_hold == TGL)
+  {
+    encL = 0;
+    opts->slot1_on = 1;
+    opts->slot_preference = 0;
+  }
+  if (state->tg_hold != 0 && state->tg_hold == TGR)
+  {
+    encR = 0;
+    opts->slot2_on = 1;
+    opts->slot_preference = 1;
+  }
 
   //interleave left and right channels from the short storage area
   for (i = 0; i < 160; i++)
@@ -1092,8 +1140,31 @@ void playSynthesizedVoiceSS4 (dsd_opts * opts, dsd_state * state)
   //CHEAT: Using the slot on/off, use that to set encL or encR back on
   //as a simple way to turn off voice synthesis in a particular slot
   //its not really 'disabled', we just aren't playing it
-  if (opts->slot1_on == 0) encL = 1;
-  if (opts->slot2_on == 0) encR = 1;
+  // if (opts->slot1_on == 0) encL = 1;
+  // if (opts->slot2_on == 0) encR = 1;
+
+  //this may have some unintended side effects that I haven't tested/explored yet, that's why its a patch only
+  //particularly in regards to 'Aero' Builds with their OSS Jank and slot_preference = 3 by default
+  //if rounds of testing in various scenaries looks good, I may expand this to P25p2 and the Float Variants as well
+  if (opts->slot1_on == 0 && opts->slot2_on == 1 && encR == 0) //slot 1 is hard off and slot 2 is on
+    memcpy (state->s_l4, state->s_r4, sizeof(state->s_l4)); //copy right to left
+  else if (opts->slot1_on == 1 && opts->slot2_on == 0 && encL == 0) //slot 2 is hard off and slot 1 is on
+    memcpy (state->s_r4, state->s_l4, sizeof(state->s_r4)); //copy left to right
+  else if (opts->slot_preference == 0 && state->dmrburstL == 21 && encL == 0) //slot 1 is preferred, and voice in slot 1
+    memcpy (state->s_r4, state->s_l4, sizeof(state->s_r4)); //copy left to right
+  else if (opts->slot_preference == 1 && state->dmrburstR == 21 && encR == 0) //slot 2 is preferred, and voice in slot 2
+    memcpy (state->s_l4, state->s_r4, sizeof(state->s_l4)); //copy right to left
+  else if (state->dmrburstL == 21 && state->dmrburstR != 21 && encL == 0) //voice in left, no voice in right
+    memcpy (state->s_r4, state->s_l4, sizeof(state->s_r4)); //copy left to right
+  else if (state->dmrburstR == 21 && state->dmrburstL != 21 && encR == 0) //voice in right, no voice in left
+    memcpy (state->s_l4, state->s_r4, sizeof(state->s_l4)); //copy right to left
+  //else if voice in both, and both slots on, and no preference on slot, then regular stereo interleave (left and right channels)
+
+  if (opts->slot1_on == 0 && opts->slot2_on == 0) //both slots are hard off, disable playback
+  {
+    encL = 1;
+    encR = 1;
+  }
 
   //WIP: Mute if on B list (or not W list)
   char modeL[8];
@@ -1130,12 +1201,37 @@ void playSynthesizedVoiceSS4 (dsd_opts * opts, dsd_state * state)
   if (strcmp(modeL, "B") == 0) encL = 1;
   if (strcmp(modeR, "B") == 0) encR = 1;
 
+  //check to see if we need to enable slot and toggle slot preference here
+  //this method will always favor slot 2 (this is a patch anyways, so....meh)
+  if (strcmp(modeL, "A") == 0)
+  {
+    opts->slot1_on = 1;
+    opts->slot_preference = 0;
+  }
+  if (strcmp(modeR, "A") == 0)
+  {
+    opts->slot2_on = 1;
+    opts->slot_preference = 1;
+  }
+
   //if TG Hold in place, mute anything but that TG #132
-  if (state->tg_hold != 0 && state->tg_hold != TGL) encL = 1;
-  if (state->tg_hold != 0 && state->tg_hold != TGR) encR = 1;
-  //likewise, override and unmute if TG hold matches TG
-  if (state->tg_hold != 0 && state->tg_hold == TGL) encL = 0;
-  if (state->tg_hold != 0 && state->tg_hold == TGR) encR = 0;
+  if (state->tg_hold != 0 && state->tg_hold != TGL) 
+    encL = 1;
+  if (state->tg_hold != 0 && state->tg_hold != TGR)
+    encR = 1;
+  //likewise, override and unmute if TG hold matches TG (and turn on slot and set preference)
+  if (state->tg_hold != 0 && state->tg_hold == TGL)
+  {
+    encL = 0;
+    opts->slot1_on = 1;
+    opts->slot_preference = 0;
+  }
+  if (state->tg_hold != 0 && state->tg_hold == TGR)
+  {
+    encR = 0;
+    opts->slot2_on = 1;
+    opts->slot_preference = 1;
+  }
 
   //interleave left and right channels from the short storage area
   for (i = 0; i < 160; i++)
@@ -1238,6 +1334,226 @@ void playSynthesizedVoiceSS4 (dsd_opts * opts, dsd_state * state)
 
 }
 
+//short stereo mix 18v superframe
+void playSynthesizedVoiceSS18 (dsd_opts * opts, dsd_state * state)
+{
+
+  //NOTE: This will run once every superframe during a sacch field
+  //exact implementation to be determined
+
+  int i, j;
+  uint8_t encL, encR;
+
+  short stereo_sf[18][320]; //8k 2-channel stereo interleave mix for full superframe
+  // memset (stereo_sf, 1, 18*sizeof(short)); //I don't think 18*sizeof(short) was large enough, should probably be 18*320*sizeof(short)
+  memset (stereo_sf, 1, sizeof(stereo_sf));
+
+  short empty[320];
+  memset (empty, 1, sizeof(empty));
+
+  //p25p2 enc checkdown for whether or not to fill the stereo sample or not for playback or writing
+  encL = encR = 1;
+  if (state->payload_algid == 0 || state->payload_algid == 0x80)
+    encL = 0;
+  if (state->payload_algidR == 0 || state->payload_algidR == 0x80)
+    encR = 0;
+
+  //checkdown to see if we can lift the 'mute' if a key is available
+  if (encL)
+  {
+    if (state->payload_algid == 0xAA)
+    {
+      if (state->R != 0)
+      {
+        encL = 0;
+      }
+    }
+  }
+
+  if (encR)
+  {
+    if (state->payload_algidR == 0xAA)
+    {
+      if (state->RR != 0)
+      {
+        encR = 0;
+      }
+    }
+  }
+
+
+  //TODO: add option to bypass enc with a toggle as well
+
+  //CHEAT: Using the slot on/off, use that to set encL or encR back on
+  //as a simple way to turn off voice synthesis in a particular slot
+  //its not really 'disabled', we just aren't playing it
+  // if (opts->slot1_on == 0) encL = 1;
+  // if (opts->slot2_on == 0) encR = 1;
+
+  //this may have some unintended side effects that I haven't tested/explored yet, that's why its a patch only
+  //particularly in regards to 'Aero' Builds with their OSS Jank and slot_preference = 3 by default
+  //if rounds of testing in various scenaries looks good, I may expand this to P25p2 and the Float Variants as well
+  if (opts->slot1_on == 0 && opts->slot2_on == 1 && encR == 0) //slot 1 is hard off and slot 2 is on
+    memcpy (state->s_l4, state->s_r4, sizeof(state->s_l4)); //copy right to left
+  else if (opts->slot1_on == 1 && opts->slot2_on == 0 && encL == 0) //slot 2 is hard off and slot 1 is on
+    memcpy (state->s_r4, state->s_l4, sizeof(state->s_r4)); //copy left to right
+  else if (opts->slot_preference == 0 && state->dmrburstL == 21 && encL == 0) //slot 1 is preferred, and voice in slot 1
+    memcpy (state->s_r4, state->s_l4, sizeof(state->s_r4)); //copy left to right
+  else if (opts->slot_preference == 1 && state->dmrburstR == 21 && encR == 0) //slot 2 is preferred, and voice in slot 2
+    memcpy (state->s_l4, state->s_r4, sizeof(state->s_l4)); //copy right to left
+  else if (state->dmrburstL == 21 && state->dmrburstR != 21 && encL == 0) //voice in left, no voice in right
+    memcpy (state->s_r4, state->s_l4, sizeof(state->s_r4)); //copy left to right
+  else if (state->dmrburstR == 21 && state->dmrburstL != 21 && encR == 0) //voice in right, no voice in left
+    memcpy (state->s_l4, state->s_r4, sizeof(state->s_l4)); //copy right to left
+  //else if voice in both, and both slots on, and no preference on slot, then regular stereo interleave (left and right channels)
+
+  if (opts->slot1_on == 0 && opts->slot2_on == 0) //both slots are hard off, disable playback
+  {
+    encL = 1;
+    encR = 1;
+  }
+
+  //WIP: Mute if on B list (or not W list)
+  char modeL[8];
+  sprintf (modeL, "%s", "");
+  char modeR[8];
+  sprintf (modeR, "%s", "");
+
+  int TGL = state->lasttg;
+  int TGR = state->lasttgR;
+
+  //if we are using allow/whitelist mode, then write 'B' to mode for block
+  //comparison below will look for an 'A' to write to mode if it is allowed
+  if (opts->trunk_use_allow_list == 1)
+  {
+    sprintf (modeL, "%s", "B");
+    sprintf (modeR, "%s", "B");
+  }
+
+  for (i = 0; i < state->group_tally; i++)
+  {
+    if (state->group_array[i].groupNumber == TGL)
+    {
+      strcpy (modeL, state->group_array[i].groupMode);
+      // break; //need to keep going to check other potential slot group
+    }
+    if (state->group_array[i].groupNumber == TGR)
+    {
+      strcpy (modeR, state->group_array[i].groupMode);
+      // break; //need to keep going to check other potential slot group
+    }
+  }
+
+  //flag either left or right as 'enc' to mute if B
+  if (strcmp(modeL, "B") == 0) encL = 1;
+  if (strcmp(modeR, "B") == 0) encR = 1;
+
+  //check to see if we need to enable slot and toggle slot preference here
+  //this method will always favor slot 2 (this is a patch anyways, so....meh)
+  if (strcmp(modeL, "A") == 0)
+  {
+    opts->slot1_on = 1;
+    opts->slot_preference = 0;
+  }
+  if (strcmp(modeR, "A") == 0)
+  {
+    opts->slot2_on = 1;
+    opts->slot_preference = 1;
+  }
+
+  //if TG Hold in place, mute anything but that TG #132
+  if (state->tg_hold != 0 && state->tg_hold != TGL) 
+    encL = 1;
+  if (state->tg_hold != 0 && state->tg_hold != TGR)
+    encR = 1;
+  //likewise, override and unmute if TG hold matches TG (and turn on slot and set preference)
+  if (state->tg_hold != 0 && state->tg_hold == TGL)
+  {
+    encL = 0;
+    opts->slot1_on = 1;
+    opts->slot_preference = 0;
+  }
+  if (state->tg_hold != 0 && state->tg_hold == TGR)
+  {
+    encR = 0;
+    opts->slot2_on = 1;
+    opts->slot_preference = 1;
+  }
+
+  //at this point, if both channels are still flagged as enc, then we can skip all playback/writing functions
+  if (encL && encR)
+    goto SS18_END;
+
+  //interleave left and right channels from the short storage area
+  for (j = 0; j < 18; j++)
+  {
+    for (i = 0; i < 160; i++)
+    {
+      if (!encL)
+        stereo_sf[j][i*2+0] = state->s_l4[j][i];
+      if (!encR)
+        stereo_sf[j][i*2+1] = state->s_r4[j][i];
+    }
+  }
+
+  if (opts->audio_out_type == 0) //Pulse Audio
+  {
+    for (j = 0; j < 18; j++)
+    {
+      if (memcmp(empty, stereo_sf[j], sizeof(empty)) != 0) //may not work as intended because its stereo and one will have something in it most likely
+        pa_simple_write(opts->pulse_digi_dev_out, stereo_sf[j], 320*2, NULL);
+    }
+  }
+
+  if (opts->audio_out_type == 8) //UDP Audio
+  {
+    for (j = 0; j < 18; j++)
+    {
+      if (memcmp(empty, stereo_sf[j], sizeof(empty)) != 0) //may not work as intended because its stereo and one will have something in it most likely
+        udp_socket_blaster (opts, state, 320*2, stereo_sf[j]);
+    }
+  }
+  
+
+  if (opts->audio_out_type == 1 || opts->audio_out_type == 2) //STDOUT or OSS 8k/2channel
+  {
+    for (j = 0; j < 18; j++)
+    {
+      if (memcmp(empty, stereo_sf[j], sizeof(empty)) != 0) //may not work as intended because its stereo and one will have something in it most likely
+        write (opts->audio_out_fd, stereo_sf[j], 320*2);
+    }
+  }
+
+  SS18_END:
+
+  //run cleanup since we pulled stuff from processAudio
+  state->audio_out_idx = 0;
+  state->audio_out_idxR = 0;
+
+  //set float temp buffer to baseline
+  memset (state->s_l4, 1, sizeof(state->s_l4));
+  memset (state->s_r4, 1, sizeof(state->s_r4));
+
+  if (state->audio_out_idx2 >= 800000)
+  {
+    state->audio_out_float_buf_p = state->audio_out_float_buf + 100;
+    state->audio_out_buf_p = state->audio_out_buf + 100;
+    memset (state->audio_out_float_buf, 0, 100 * sizeof (float));
+    memset (state->audio_out_buf, 0, 100 * sizeof (short));
+    state->audio_out_idx2 = 0;
+  }
+
+  if (state->audio_out_idx2R >= 800000)
+  {
+    state->audio_out_float_buf_pR = state->audio_out_float_bufR + 100;
+    state->audio_out_buf_pR = state->audio_out_bufR + 100;
+    memset (state->audio_out_float_bufR, 0, 100 * sizeof (float));
+    memset (state->audio_out_bufR, 0, 100 * sizeof (short));
+    state->audio_out_idx2R = 0;
+  }
+
+}
+
 //largely borrowed from Boatbod OP25 (simplified single tone ID version)
 void soft_tonef (float samp[160], int n, int ID, int AD)
 {
diff --git a/src/dsd_main.c b/src/dsd_main.c
index 1d2616b..924bf00 100644
--- a/src/dsd_main.c
+++ b/src/dsd_main.c
@@ -745,7 +745,7 @@ initOpts (dsd_opts * opts)
   //slot preference is used during OSS audio playback to
   //prefer one tdma voice slot over another when both are playing back
   //this is a fix to OSS 48k/1 output
-  opts->slot_preference = 0; //default prefer slot 1 -- state->currentslot = 0;
+  opts->slot_preference = 2; //default prefer slot 1 -- state->currentslot = 0;
 
   //hardset slots to synthesize
   opts->slot1_on = 1;
diff --git a/src/dsd_ncurses.c b/src/dsd_ncurses.c
index 4646e77..fc3f28b 100644
--- a/src/dsd_ncurses.c
+++ b/src/dsd_ncurses.c
@@ -2568,11 +2568,11 @@ ncursesPrinter (dsd_opts * opts, dsd_state * state)
   {
     printw ("| Voice Error: [%i][%i] Slot 1 (1)", state->errs, state->errs2);
     if (opts->slot1_on == 0) printw (" OFF");
-    if (opts->slot1_on == 1) printw (" ON");
+    if (opts->slot1_on == 1) printw (" ON"); if (opts->slot_preference == 0) printw (" *Preferred");
     printw ("\n");
     printw ("| Voice Error: [%i][%i] Slot 2 (2)", state->errsR, state->errs2R);
     if (opts->slot2_on == 0) printw (" OFF");
-    if (opts->slot2_on == 1) printw (" ON");
+    if (opts->slot2_on == 1) printw (" ON"); if (opts->slot_preference == 1) printw (" *Preferred");
     printw ("\n");
   }
   printw ("------------------------------------------------------------------------------\n");
@@ -3654,8 +3654,8 @@ ncursesPrinter (dsd_opts * opts, dsd_state * state)
     //switching, but want to control each seperately plz
     if (opts->slot1_on == 1)
     {
-      opts->slot1_on = 0;
-      opts->slot_preference = 1; //slot 2
+      opts->slot1_on = 0; if (opts->slot_preference == 0) opts->slot_preference = 2;
+      // opts->slot_preference = 1; //slot 2
       //clear any previously buffered audio
       state->audio_out_float_buf_p = state->audio_out_float_buf + 100;
       state->audio_out_buf_p = state->audio_out_buf + 100;
@@ -3680,8 +3680,8 @@ ncursesPrinter (dsd_opts * opts, dsd_state * state)
     //switching, but want to control each seperately plz
     if (opts->slot2_on == 1)
     {
-      opts->slot2_on = 0;
-      opts->slot_preference = 0; //slot 1
+      opts->slot2_on = 0; if (opts->slot_preference == 1) opts->slot_preference = 2; 
+      // opts->slot_preference = 0; //slot 1
       //clear any previously buffered audio
       state->audio_out_float_buf_pR = state->audio_out_float_bufR + 100;
       state->audio_out_buf_pR = state->audio_out_bufR + 100;
@@ -3701,6 +3701,13 @@ ncursesPrinter (dsd_opts * opts, dsd_state * state)
     }
   }
 
+  if (c == 51) //'3' key, cycle slot preferences
+  {
+    if (opts->slot_preference < 2)
+      opts->slot_preference++;
+    else opts->slot_preference = 0; 
+  }
+
   if (c == 43) //+ key, increment audio_gain
   {