I also posted this on r/ShutterEncoder but wanted to submit it here as well.

The problem

Currently, when working with the "Replace audio" function or audio settings, Shutter Encoder only accepts a single (multichannel) audio file. In broadcast post-production it's very common to receive audio as discrete mono WAV files — for example 6 mono files for 5.1 and 2 mono files for a stereo downmix.

This means I have to pre-interleave them into a multichannel WAV before I can use Shutter Encoder, which adds an extra step to my workflow.

The request

It would be great if Shutter Encoder could accept multiple mono WAV files and let the user assign each one to a specific output channel (Ch 1 through Ch 8) directly in the UI — so ffmpeg handles the merging internally via amerge/pan filters.

As a bonus, auto-detecting channel assignment from common filename suffixes (_L.wav, _R.wav, _C.wav, _Lfe.wav, _Ls.wav, _Rs.wav, _Lt.wav, _Rt.wav) would speed things up even further.

Why it matters

This would let broadcast professionals go straight from ProRes master + discrete mono audio to final delivery (e.g. XDCAM HD 50 MXF with 8-channel audio) without needing an NLE or external tools as an intermediate step.

Thank you for all your work on Shutter Encoder — it's an incredible tool!