i have a Hotplate that i have used with both my 2204 and my Shiva. i stopped using it because it adds a very quiet but noticeable buzz on top of the tone, which is heard most easily on clean tones. when i first heard the noise i thought it was the 2204 and it drove me crazy trying to find the source. then when i heard it with the Shiva also . . . so anyone else heard this? is it just THD or others too? (i never attenuate more than -8dB) thanks.