Further Adventures in Pitchfactor in loop: And not a happy story. I thought perhaps the fact that the Octaver is a gain effect might also be an issue, I know that putting gain effects in the effects loop is generally not advised. So I tried it again with the gain of the effect (bottom knob, second from right) turned full off. That did not help. I then thought to listen to the Diatonic using the loop, and really it did not sound right to me, sort of distorted, just not right. Then I noticed some crackles from my amp. I thought maybe the cables were bad and tried to figure it out. The crackles got worse, this went on for 10 minutes. I then looked in the back of the amp. One of my tubes was badly red plating. Meaning now I have to buy a new set of 4 tubes, they are fried. A coincidence? Nearly new tubes, but I did not jump to conclusions. So I hooked the Pitchfactor up to my other Amp's effects loop (also a Carvin). I had the same poor performance, and then I heard a few crackles. I unhooked that Pitchfactor immediately, and fortunately none of the tubes had started to red plate. I now am running it outside the effects loop, it will never go back in there, I have learned my lesson. As the Pitchfactor works just fine outside the loop, this is one of those things that I think I am going to have a hard time convincing anyone of this being an issue. I don't jump to conclusions, but when that second Amp crackled, and it had never done that before, well I think it is a reasonable conclusion that something is going on here. Eventide?