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+**Version:** 0.3.0
+
+Decoders
+---
+
+Each decoding [channel](Channels_V0.3.0) requires one primary decoder and can optionally
+have one or more auxiliary decoders running at the same time.  If you want to 
+run multiple primary decoders on the same frequency, create separate channel configurations
+for each primary decoder.
+
+Primary Decoders
+---
+  * [AM](AM) - AM demodulator
+  * [LTR-Standard](LTR) - FM demodulator and Logic Trunked Radio (LTR) trunked radio signaling decoder
+  * [LTR-Net](LTRNet) - FM demodulator and LTR-Net trunked radio signaling decoder
+  * [MPT-1327](MPT1327) - FM demodulator and MPT-1327 trunked radio signaling decoder and automatic trunked channel following.
+  * [NBFM](NBFM) - narrow-band FM demodulator.
+  * [Passport](Passport) - FM demodulator and Passport trunked radio signaling decoder.
+  * [P-25 Phase 1 C4FM](APCO25) - FM demodulator with P25 message decoder and automatic trunked channel following.
+  * [P-25 Phase 1 LSM](APCO25) - Quadrature demodulator with P25 message decoder and automatic trunked channel following.
+  
+Auxiliary Decoders
+---
+Auxiliary decoders are designed to process demodulated audio or in-band 
+signaling that is normally layered on top of another digital protocol or FM
+modulated analog repeater channel.  These layered protocols provide services 
+like Automatic Number Identification (ANI), status messaging, GPS location, 
+emergency notification, etc.  Auxiliary protocols may be transmitted when the 
+mobile radio user keys the microphone, or in the case of GPS, they can key the 
+radio and transmit the GPS location without any user actions.
+
+How do auxiliary decoders work?  Demodulated audio from a primary decoder's FM 
+demodulator is simultaneously routed to each of the auxiliary decoders
+and the decode results are added to the Events and Messages lists, as well as
+displayed in the [Now Playing](NowPlaying_V0.3.0) window.
+
+Auxiliary decoders are normally used with analog decoders like NBFM, LTR, 
+LTR-Net, and Passport.
+
+  * [Fleetsync II](Fleetsync2) - decodes ANI, Acknowledge, Status, Paging and GPS bursts
+  * [LJ1200](LoJack) - decodes LoJack data bursts on 173.075 MHz in US.
+  * [MDC-1200](MDC1200) - decodes MDC-1200 ANI bursts.
+  * [Tait 1200](Tait1200) - decodes Tait CCDI protocol GPS location bursts.
+
+**Note:** there are a wide variety of these auxiliary service protocols that can be 
+easily added to SDRTrunk.  If you encounter a new audio-band protocol, collect
+a number of good quality sample recordings and contact the author via the 
+google support group for possible inclusion in the sdrtrunk application.