A-199 Spring Reverb Module : This reverb unit can do a lot more than surf

I would say at the outset: don't buy this module expecting the best reverb sound available. There are other external (and much more expensive) units which will claim to give you that. This module comprises the main unit with amplifier, sockets and controls mounted to an 8hp front panel, and a satellite reverb tank connected to the main unit with standard RCA phono connectors. The nature of the tank (which is a medium spring low-cost Accutronics tank such as you would expect to see in a medium-priced guitar amplifier) means that it must be mounted as far away from the power supply as possible to avoid interference. I have a P9 case, and found that mounting the unit with velcro at the top of the left side of the case resulted in the hum being reduced to a negligible level. The interesting element of this module is that it provides a feedback control which allows you to feed the reverb signal back into the unit OR feed an external signal in there instead, which can lead to all kinds of crazy sounds. I've found that with a bit of tweaking I can get an acceptable reverb sound with this module, but most of the time I'm happy to use external effects for this purpose and use this as a rather interesting way to manipulate audio.