The MOTU 828 and 896 can direct monitor (with no latency) a mono or stereo analog signal. If you wish, you can monitor more than one input simultaneously by disabling direct hardware patchthru, and monitoring the input though the host software sequencer. For example, in Digital Performer's Input Monitoring mode, set "Monitor record-enabled tracks through effects." Then you can patch thru multiple audio input sources, with latency being dependant is point on your buffer settings (lower buffers result in lower latency).