I'm looking for a setup with 30 analog outputs sound card.
For now the only product I can see is the Motu 24io (2 of them), which seems to be out of date.
Any idea of another hardware?
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Many professional external audio interfaces can be stacked or extended to get more inputs/outputs: RME, MOTU, Avid (Pro Tools HD), SSL, Apogee...
Some work by daisy chaining firewire or thunderbolt interfaces, others use a PCIe card with one of more dedicated digital multichannel interfaces that connect to rack hardware containing the analog inputs/outputs.
You could get a very solid 30 output system from RME using their MADI DA:
Not cheap though!