If you want to try it with no audio on the C1500/Monitor desk (no headphone, I/O, card) then you can simply plug the network port on the S1500 (not GigaAce) into the network port on the DM. All surface controls and meters will work, just no audio.
On the supported audio paths (if you are using a slot GigaAce connection to secondary surfaces), with only 128ch vs 300+ available, please confirm the following:
– Headphones (as the designated PAFL)
– Local I/O
– DX (1 or 2, depending on class)
– USB playback/record