Can someone tell me which micro amp (or light combo) comes closest to producing the most tube growl? I'm not looking for the warm vintage tube sound nor the fully electric guitar distortion tube sound either; just slightly overdriven, growly, tube sound. An example of the tone I'm looking for is on "Black Velvet": How much does compression come into play with this sound? I've had both ver. 1 & 2 of the VT Bass pedal and no matter how I set it, it just sounds mushy and distortion guitarish to me instead of a tight, growly tube sound. Can the Aguilar Tone Hammer pedal do this? What about the TH 350? I understand I will be getting a lot of responses that say "A real tube amp is the only way!", but I'm really looking for a micro amp that comes close.