S/PDif is 2 channels. According to Tascam 1641 documentation, 16 is your limit on Schnitzengruben. I'd be surprised if you can actually track that many successfully with USB anyways. Good luck with that.
If you really need 20 channels then you need to get either a firewire interface or a PCI/PCIe desktop interface.
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S/PDif is 2 channels. According to Tascam 1641 documentation, 1
S/PDif is 2 channels. According to Tascam 1641 documentation, 16 is your limit on Schnitzengruben. I'd be surprised if you can actually track that many successfully with USB anyways. Good luck with that.
If you really need 20 channels then you need to get either a firewire interface or a PCI/PCIe desktop interface.