After a friend went out and bought a Boss RC-50 for his poratable workstation / practice rig I did some research and discovered the Digitech GNX4. They claim it has an 8 track Jamman... is it at all featured like the Jamman? Does if have a feedback level adjustment? Does it do reverse on the fly? Can some one give us a looper-centric review? -- ... http://www.zmix.net