Ed,

Sorry I didn't get to this earlier. First and foremost, post a list of the total pieces of equipment that you are using at any given time when recording--keyboard, computer, vocal processor, etc...

Also a breif description of the hookup, such as what goes into what, whether or not the equipment is powered with wall warts or internal power supplies, anything that will provide me with a lead of where to go with this one.

Most of the time humm is caused by a single, offending component, and this can often be isolated by merely disconnecting components one at a time until the humm dissapears. Give it a try and post the information.

Gary

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Travlin' Easy