Currently Being ModeratedAug 8, 2012 7:26 AM (in response to dkmccreight)Re: Spider II - HD 150 Volume Drops
Is it possible that vibrations are causing the channel volume knob to move? If you were using a preset sound and the knob moved, 'waking it', the volume would drop to the level where the knob is pointing to. A loose control pot is the actual culprit, not the knob itself, but putting something under the knob (like an o-ring) can tighten it up so that it doesn't turn from vibration.
This doesn't explain the volume increase, though, unless the knob is vibrating to a higher volume setting.