I’m testing out MODEP using PiSound and a Raspberry Pi 3B - it seems to work great at a certain level, but I get an awful lot of clipping.
I’m trying a simple setup with a reverb unit (like Roomy) into GXAmplifier-X, then straight to the output. The input is my guitar, the clipping light on the PiSound never lights up (I’ve got the gain down to a sensible level). It’s also not clipping on the way out to my mixer - I’m generally always at about -6dB or more. The problem seems to be when I use a lot of attack playing the guitar, I get some great distortion sounds out of GXAmplifier-X, but at a certain level I get digital clipping on top.
Changing to a clean-sounding amplifier setting, I can still get the clipping if I strum full chords, especially using the lower-octave strings. It’s like I’m running out of headroom?
I figure the clipping is happening in the digital domain within MODEP itself, so I thought maybe if I put a limiter at the end of the signal chain, I can stop it from happening… but, bizarrely, any limiter I use just clips like crazy as soon as I hit the threshold level! Turning the threshold level down makes the clipping worse, turning it up all the way generally gets it back under control.
I’ve found by turning the output level down on the GXAmplfier-X seems to help, and I can virtually eliminate it, but I still occasionally hear some clipping and I have to get the output down pretty quietly. It’s also find by switching guitar to something with more gain, of course the clipping can come back, and I therefore need to set up my volume levels really carefully on a per-guitar basis, which means setup time on a guitar-by-guitar, patch-by-patch basis. I’d just love to be able to plug-and-play with this thing but I can’t.
Is there something I can do in MODEP to prevent clipping? Or would something like a DI box help?