Accentuated Fret Buzz / High pitch noise

[nick8185]

Hi all,

I'm finding some weird high pitched noises coming from amp blocks.

The best way I can describe it, is that the high gain amp blocks amplifies fret buzz to a ridiculous level.

I'm currently using the hx stomp into effects loop of a couple of amps of mine.

If I use the preamp of these amps, with the helix as the boost all is well, but if I use an amp or preamp block in the the return I get these weird noises:

https://www.dropbox.com/sh/jpoa1o5wpzuz05g/AAAY44LpTZmRGjbWzsDJ7i7pa?dl=0

I've tested:

6505mh preamp: fine

real 5150: fine
Marshall DSL100: fine

STL Plugin: fine
6505mh with helix in effects return: artifacts
DSL100 with helix in effects return: artifacts

I've got a high and low cut on master, as well as tested input impedance and master volumes/eq etc. on amp blocks

Some preamp/amp blocks have less than others but I've chosen to add the 5150 in the demo above because it was one of the worst ones.

If you want any more tests uploaded I'm happy to.

Thanks in advance!