I'm wasting my breath I know, but if a Transmitter is affecting a non-radio device it can never be the fault of the Transmitter. As you say, the problem is lac

I'm wasting my breath I know, but if a Transmitter is affecting a non-radio device it can never be the fault of the Transmitter. As you say, the problem is lack of "Immunity" in your guitar amp, and not a fault in the transmitters around you. Importantly there is nothing which can be done at the Transmitters to cure your problem. Only better design of your music equipment will fix the problem. Your claim that "High gain distortion are susceptible due to their nonlinearity" is just wrong. Any electronics can be properly shielded by good design. That your fuzz-pedal misbehaves is due to cheap design. The topic here is spurious emissions, which are a tiny, tiny percentage of actual wanted transmissions. If your guitar amp is effected by spurious emissions, then it would be totally wiped out by any radio transmissions in your neighbourhood.