I have started playing around with sounds for AI planes in FSX, and using sounds from a RR 757 set for FS2004 and changing the filenames to match slightly modified soundai.cfg's. In principal it works fine, but tuning is difficult as there are a number of parameters I have no idea about.1st - is someone able to confirm that the relevant parameter for any JET_WHINE entry in the soundai.cfg is N1, while the relevant entry for any COMBUSTION entry in the soundai.cfg is N2?2nd - and the real missing piece is what percentage is the AI aircraft engine in FSX assuming for N1 and N2 during various phases of flight (eg idle, taxi, take-off, in-flight etc), as until you know these, it is impossible (other than by trial and error) to tune the RPARAMS and VPARAMS in the soundai.cfg so that certain sound types only play when they should.eg I am trying to get the very distinctive RR RB211 whine sound working (which I have the sound for from the FS2004 pack). It cuts in on a real 757 engine when N1 is close to take-off thrust. Unfortunately, if I set any of the VPARAMS for this sound to a volume setting of more than 0, it seems to play the sound at full volume, irrespective of what the aircraft is doing (and it does not make this noise when it is idle or taxiing). Perhaps the AI aircraft engine assumes N1 is 95% as soon as the engine is on for the purpose of determing which of the VPARAMS and RPARAMS to apply from the soundai.cfg.Any help would be gratefully appreciated. Successfully managed to port a set of Trent 700/800 sound across from an A330 to make a AI sound set for these engines, and they sound great, and have modified a CRJ Soundai.cfg to put some ERJ sounds in and that works OK too.Kind regardsRob

A great place to start would be this link discussing the FSX SDK.http://msdn.microsoft.com/en-us/library/cc526952.aspxTo make it much, much, much easier to adjust your sounds I would highly recommend investing in FS Sound Studio available from Flight 1. You can configure the sounds to your liking in FSSS and the program will take care of the parameters in the .cfg file for you. For converting sounds I use a freeware M4a to MP3 converter, which let's me use MP3s and convert them to WAVs. Audacity is a great freeware program for altering the WAV files.

A great place to start would be this link discussing the FSX SDK.http://msdn.microsoft.com/en-us/library/cc526952.aspxTo make it much, much, much easier to adjust your sounds I would highly recommend investing in FS Sound Studio available from Flight 1. You can configure the sounds to your liking in FSSS and the program will take care of the parameters in the .cfg file for you. For converting sounds I use a freeware M4a to MP3 converter, which let's me use MP3s and convert them to WAVs. Audacity is a great freeware program for altering the WAV files.

Thanks - got the SDK - doesn't tell you whether N1, N2 or Prop RPM is the paramter driver for a particular entry in the sound or soundai.cfg, and does not give any clues as to what rate of N1 or N2 is assumed for AI planes in different phases of flight. Guess I'll keep fiddling with the VPARAMS to find out at what percentage level of N1 or N2 sounds start becoming played by the AI engine.