May be of interest to some...(only 2 track recording at a time).
...but cheap ~ $199, so if you have your own mic preamps...
http://www.gearwire.com/tascam-dp-004-wnamm-09.htmlhttp://www.youtube.com/watch?v=fA81G2_07wQhttp://www.tascam.com/products/dp-004;9,16,3707,14.htmlConnections:
* Two 1/4" unbalanced mic/line inputs
* Switchable guitar input
* Headphone/Line output
* USB 2.0 connector
Recording:
* Four-track digital multitrack recording
* CD-quality 44.1kHz/16-bit WAV recording
* Records to SD Card media (1GB card included)
* Autopunch, repeat and record undo
* Dedicated stereo mixdown track
Physical:
* Powered through AA Batteries or optional PS-P520 power adapter
* Battery life: About 8 hours recording, about 8.5 hours playback (alkaline batteries)
* Dimensions: 6.1" W x 1.3" H x 4.2" D (155mm W x 33.5mm H x 107mm D)
* Weight: 2.8 oz (360 g, w/o batteries)