I have a Bachmann ALCO S-2 with Sound Value decoder using NCE Power Cab system. All the decoder CV's are set at factory defaults.

I'm happy with the actual loco speed vs. speed steps. I use speed steps 1 - 6 for most switching ( 2.5mph - 10mph). I use speed steps 10, 13, and 20 (15mph, 20mph, 30mph) on the main switching run. The turbo rev sound notches up at speed steps 1, 7, 14, 21, etc. Is there any way I can change the turbo rev up sound to increase at speed steps 1, 3, 6, 9, etc., without disturbing the speed CV's? Or can I change the turbo rev increase setting so I can manually notch it up with a function key?

Thanks!
Len