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would appreciate someone replying to this as I don't want to ruin my expensive UAD Apollo by pumping in modular levels of audio.
-- greenfly

The Apollo should be able to handle it. Eurorack level is around 10V. If it doesn't have the headroom it'll just distort. If we were talking 100V then I'd be cautious.

If you're worried, buy a line level output module that converts synth level to line level. I don't think you have a lot of room left in your case. But you could easily swap out your expert sleepers modules for a line level output module and just pop in the expert sleepers modules when you need them.