A DSP mixer allows you to route any signal to any output and gives you a 4-band EQ and compression for each channel, allowing you to tweak a monitor or headphone mix. Allowing you to record up to 16 channels simultaneously in up to 24-bit/96 kHz resolution, the US-16x08 USB Audio/MIDI Interface from Tascam features 8 XLR microphone inputs with their Ultra-HDDA preamps and 8 TRS line level inputs, 2 of which can be switched to instrument level for DI recording.