I've just noticed an odd issue.
When I engage the FX loop on my Renegade on the red channel, there's a noticeable drop in tone (the high end rolls off a lot). This happens regardless of whether any of the pedals in the loop (which are all true bypass) are switched on or not. This isn't noticeable on the green channel.
If I unplug the loop from the back of the amp, there's no tone loss on the red channel.
Anyone know what might be causing this? It's only just happened.
