Do a few other things also -
1. half the volume if the player is off the throttle, if possible play seperate ON and OFF-POWER engine soundfxs. The ON-POWER sfx should be harsher and more powerful.
2. introduce a volume drop when changing gear, so it sounds like a lift - drop the volume to 1/4 or something, then ramp it back up in the new gear.
3. rev the engine slightly higher in each gear than the previous one - shift the pitch range so it plays a bit further up the pitch scale in each gear.
4. Add a wind noise and ramp the volume dep. upon speed.
5. add a transmission whine volume dep. upon in-gear speed.
1. half the volume if the player is off the throttle, if possible play seperate ON and OFF-POWER engine soundfxs. The ON-POWER sfx should be harsher and more powerful.
2. introduce a volume drop when changing gear, so it sounds like a lift - drop the volume to 1/4 or something, then ramp it back up in the new gear.
3. rev the engine slightly higher in each gear than the previous one - shift the pitch range so it plays a bit further up the pitch scale in each gear.
4. Add a wind noise and ramp the volume dep. upon speed.
5. add a transmission whine volume dep. upon in-gear speed.