Here's what I use for multichannel transcription and for recording my band live, if the latter has any relevence for you:
https://www.mixonline.com/technology/tascam-dr-680-portable-recorder-review-369481
It's been around a while (review is from 2010, when it listed for $1400). They seem to go for c.$240 on eBay. There's a newer model with improved mic preamps, which don't matter if you're recording line-level sources like the multichannel analog outs of an SACD player to pick a random example. The mic preamps in mine sound great to me, but for the target audience of sound-for-video the upgrade might matter. All 6 analog inputs accept trs or ts 1/4" plugs (balanced or unbalanced respectively).
Major advantage of this approach- you don't tie up your computer dubbing stuff in real time. You can record 6 channels at 96/24, and the results can be 6 mono files, 3 stereo files, or one 6-channel file. There's also the ability to record in stereo at 192/24 or to record 4 mp3 files simultaneously. Lower sample rates are available too.
It records onto SD cards, so after recording pop the card out, put it into your computer's card reader and go to town. Drag the files to your HD and thence to your audio app of choice. Or leave the card in the dr-680, connect the 6 rca outs to your receiver and hit play.
I agree with the reviewer that the menu system is a little wacky but for recording line-level sources you hardly dip into the menus at all. I have never experienced the error msg the reviewer mentions and would tend to blame the fact that in 2010 some of this SD stuff was still new and standards were still settling down. There have also been os updates since then, one way or another seems a non-issue at this point. I've used 16gb and 32gb cards, 6 hires tracks at once does chew through storage pretty fast.
On my antique macbookpro I have an app called 'Burn' that will take the 6-chan files and burn them to a dvd-audio disc, but one might need to limit sample rate to get something playable without using MLP compression. This also assumes that when recording you connect your inputs and outputs in accordance with standard channel assignments for playable results. There's plenty of advice on QQ on diy dvda so... I'll (finally) stop.