I would debate that point, Bruce. With a decent motor and proper belt tension as well as having an SMS-2, SMS-3 or SMS-5 and a properly set up keyboard, there will be no noticeable change in pitch. Of course if your pinch rollers are like hockey pucks and you have to crank them and the pressure pads down to any degree to get it to play, that might be true. When I get my Trons set up and properly adjusted, I can strobe the flywheel and watch as I play and everything is rock steady, even with many keys depressed simultaneously. Now obviously most Trons are not set up and adjusted as well as they can/should be or the motors have never been cleaned, rebuilt or replaced.
Frank
In a message dated 7/25/2010 7:35:22 P.M. Eastern Daylight Time, pocotron@yahoo.com writes:
This extends to the slowing effect that depressing a key has on the capstan. Good motor controllers smooth this out, but it is still subtly there, and can affect other notes already playing.