That high quality and dynamic PCB will make the sound you want !!... proportional to the throttle !
It incluse a specialized sound synthesizer and sound maker with loop and other great adjustments.
http://www.modelsolutions.ca/catalog_sound_systems.htm
SFX6.4 ULTRA HIGH PERFORMANCE SOUND MODULE
Item Name : SFX6.4 Ultra High Performance Sound Module
Item Number : SFX6.4
Price : CAD$199.95
Voltage : 10 - 26Volts
Power Output : 40 Watts (peak) at 26Volts!!
Dimensions : 44mm x 68mm x 14mm (1.73" x 2.68" x 0.6")
Weight : ONLY 24 grams (0.85oz)!
Maximum Sample Rate : 16 bit, 46875 samples/second
Sound Output Level : 106dB!! at 26 Volts using two of our
4" 20Watt 4Ohm Speakers in series
These modules offer TWO completely independent throttle controlled engine sounds which are proportional to two throttle stick positions. Both forwards only (e.g. model aircraft) and forwards/reverse (e.g. model boats and tanks) are accommodated. In addition, up to 16 other sounds can be controlled using a spare channel.
For model tanks and naval vessels, the second proportional "engine" sound can be used as a proportional gun turret rotation sound. This means that the speed of the turret rotation sound is proportional to the amount of stick movement from its centre position.
Remote Volume Control is possible if eitherThrottle2 orSoundSelect2 inputs are not used.
You can download your own sounds to this module using its USB interface and the user friendly SFXPC3 Windows 7/Vista/Windows XP 32/64 bit application.
A mini-B USB port is on-board.
Doc