I had a Trace Elliot amp a few years ago, a GP11 I think it was which had a pre shape button. When this was engaged it applied a mid scoop. Do you think this sounds like a similar feature to the color button on the M80? If I remember correctly this was for the modern slap tone, and not the sort of thing to be used for a classic Fender bass tone. To get a classic Fender bass tone I guess the color button should not be enaged.
