I have the requirement to modulate the pitch of a repeated played sound (for a glider vario) from within a gauge. FSX has the basic mechanism to do this (i.e. vary the pitch) with wind, engine, prop sounds and its own variometer sound. WIND - modulated with airspeed (can't change that) VARIOMETER - modulated with 'VARIOMETER RATE' (non-writeable) ENGINE (COMBUSTION or PROP) - modulated with what?? i.e. if I want to create a repeating sound varying in pitch but *control* that pitch from within a gauge, is there a *writeable* variable I can write which would influence the sound, e.g. "PROP RPM:2" ?? I'm assuming I'd create a 'spoof' engine, set all parameters like fuel usage and thrust to zero, set the PROP wav to my sound, and then adjust the pitch via the PROP RPM variable. Any advice/comments MUCH appreciated.... thanks, B21 p.s. I've successfully configured the sound for [variometer] but can't seem to unlock the playback from the hard-coded VARIOMETER RATE value, and that's not what I want unless I could write that value from my vario.