Zimo MS450R Sound Decoder  with NEM452 (8 pin) plug
Includes Stay alive
Custom, premium speakers available separately to suit your model... 4 ohm output capable
http://www.zimo.at/web2010/products/ms-sound-decoder_EN.htm
Key summary:
NRMA DCC data format with function mapping + Swiss mapping
30x15x4mm
Up to 16 bit audio at 44kHz
128Mbit of sound memory – 360s of sounds at 16 bit 22kHz
3W 4-8Ohm speaker output – (e.g. at least 2 standard sugar cubes)
Track voltage: 7-35V
Motor max continuous current: 1.2A
Motor peak current (~20 sec): 2.5A
Functions max total current: 0.8A
Max total motor + function output: 1.2A
4 amplified function outputs on wires, 6 amplified function outputs on solder pads
2 logic level outputs (functions/servos/SUSI)
1 switch input
Stay alive capacitor connection pads- low cost stay alive design (just connect a capacitor!)
Shunting mode
Support for automatic uncoupling
Addresses 1-10239
Lighting effects: flashing, dimming, soft start, American lighting effects, etc.
Advanced momentum features
Operable brake via function key
Ability to switch between multiple sound files
16 sound channels with simultaneous playback
8 random sound generators
Programmable to two complete sets of CV’s
Railcom
Operable on DC