Hello,

I have a problem with HD500 effects loop. When loop block is introduced to the effects chain it produces white noise like hum. The problem is not caused by some other gear in the loop or my guitar because it's the same when nothing is connected to the HD500 (besides something to hear the POD sound). It is most apparent when loop is placed before an amp (virtual in the chain) and the noise is amplified or before the mixer when the signal is boosted there. The loop doesn't even need to be on (as turning it on and off only disables the send), and to eliminate the problem you have to delete the loop from the chain.

If someone wants to check if it's the same on theirs unit then simply open an empty patch, put the loop block in the chain, put the amp before the loop (best when it's a high gain amp) and listen to the noise when you delete the loop (from the chain, not turn in on and off) and then put it in again. It may not be that apparent when using headphones but when you play on rehearsal levels then it is very problematic.

I attached mp3 and a patch (links below) that I used to create the mp3. It's just the effects loop and treadplate simulation. Only usb cable and headphones were connected to the POD (no guitar). When you listen to the file it's alternating between noise and silence when I put in and remove effects loop block and later on I boost the return signal to make the problem more audible.

I understand that when you play loud then there will always be some noise but I don’t understand why effects loop introduces noises of its own even when there is nothing connected. Is this normal?

Thanks for any help

mp3 file (for some reason normal uploading didn't work): http://www.mediafire.com/?ryxcu24b5l0dyxo

patch link (unfortunately custom tone didn't want to cooperate with me): http://www.mediafire.com/?q0o37rt6yi6a9yf