Glensound GS-FW012 Four Channel 4 Wire BoxThis is a mains powered desktop portable unit that provides 4 off 4 wire circuits with the useful addition of 1 extra audio input (PGM). OPTIONS GS FW012A: Circuits 1 and 2 have none latching push buttons instead of lever keys. There is a solid plastic scribble strip above the lever keys Four additional female XLR outputs (1 per circuit) The A version was a customer modification. Glensound can also look at further variations for your requirement so