Yes, you can use up to 18 if you use the ADAT and the S/PDIF.

BobRogers wrote: Yes, you can use up to 18 if you use the ADAT and the S/PDIF.

i used all eight in the digi001 so 002 can handle it..now if your hard drive is acting up you have a other problems then protools.
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Yes, you can use the XLRs and the .5" at the same time. I do it regularly. I havn't been able to get the S/PIDF to work simultaniously, but the band decided not to play with the CD anyway and I was saved that embarassment.

Aren't there clocking issues involved with using both the ADAT and S/PDIF simultaneously? Digi claims you can do 18, but not without limitations - from what I understand.

To use the Lightpipe and the SPDIF at the same time, you have to be using one master clock for both, so you either need a device that has both, or set up to clock one A/D form the other or another master clock for both.