Gallien Krueger 250ML internal trimmers

[sundaypunch]

I have a GK 250ML. If you remove the top lid there are several internal trimmers to adjust the gain, effects, etc. Does anyone know what each does? If I can avoid it I would rather not just randomly start messing with them. I did a Google search with no luck.

[claudel]

The manual for it used to be posted on the GK-Website and it explains what they are and what they do.

Don't know if it still is.

I've been jonesing for one of those lately.

[sundaypunch]

I found the manual on their website-

http://www.gallien-krueger.com/manuals/250ml.pdf

They don't reference the internal trimmers other than to say that they are pre-set and can be adjusted by a factory technician. I guess I can email their customer support and see if they will tell me.