MOTU M4 This is a 4-in/4-out audio interface. Used only indoors and very infrequently. It sounds great, is very easy to use with loopback functionality, and offers excellent sound quality for the price. Purchased about a year ago from a musical instrument store in Kyoto. From Soundhouse: It generously employs ESS Sabre32 UltraDAC converter technology, typically found in audio interfaces costing hundreds of thousands of yen. Features include a clean preamp achieving -129 dBu EIN and main outputs measuring a dynamic range of 120 dB.