On Wednesday, December 1, 2010, Olin Lathrop wr= ote: > See attached. My mistake. Forgot to mention that the microphone is USB based. The filter needs to be through software unless I can make an active filter with a PIC32 with USB host. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .