Antoine said:
Always pulled for me, in RHY2 and LEAD mode, i find the sound more smooth this way.
When pushed, the sound become more harsh and rigid, which i don't like at all, plus when pushed, the volume gets higher.
I agree. I always have mine pulled as it produces a much smoother distortion. When the presence is pushed in I find it extremely grating to the ears and I always end up pulling it again. The Mark IV is a very focused animal with alot of presence as it is, but when the presence is pulled it gives the sound a much more spacious, "chewier" sound, and it seems to balance out the presence of the amp. Pushing in the presence knob is overkill for me, so I constantly find myself pulling it and setting it to '0'. The manual also suggests this setting for a Mark IIC+ sound interestingly enough, and I can understand why.