Hey @nextstep and welcome to The Sound Explorers Forum!
I think you’re over thinking this a little, which is pretty easy if you’re new to all this.
Think of your computer as the ‘hub’ for all of this as you’re using/will be using a DAW.
Connect your audio interface, Minifuse, to your computer via USB, as it’s supposed to be.
The Minifuse will then act as your audio and midi interface. (you can also connect the MicroFreak and DBI via USB if you don’t have enough ‘DIN’ midi sockets for your usage. Most of us have a mix of the two, or have done/will do at some point. If you’re wanting to purely use DIN midi, then you’ll have to chain the MF and DBI by going from Midi OUT on your MiniFuse to Midi IN on one of your devices, for arguments sake we’ll say MF and DBI in that order.
So, connect Midi OUT from your MiniFuse to the Midi IN on your DBI, Midi OUT of the DBI to Midi IN on your MiniFuse. Now you can see you’ve made a complete ‘circuit’ in effect.
You’ll also need to put each device on its own midi channel, or else you’ll trigger both devices with the same midi notes, unless that’s what you want of course.
You might have to configure your MF or DBI to do so though by using their internal settings options.
So now we have your ‘Midi circuit’ connected and your MF on Midi channel 1 and the DBI on Midi channel 2.
For audio connections, you’re currently using a Hi-Fi amp, it would be a really good idea to put some kind of small mixer between your AudioFuse and Hi-Fi amp, or get some kind of monitoring system capable of handling the higher output levels of more professional gear.
Hi-Fi gear works at -10Db, whereas most pro audio gear works at +4Db, so you’re running the risk of damaging your Hi-Fi amp if you’re not careful. A set of powered monitors will also be flatter in frequency response, which is more desirable for musing production.
You can connect the audio outs from your MF and DBI to the audio inputs on the front of your MiniFuse and monitor the two either through your DAW or MiniFuse.
For DAW specifics, you’d be better off posting on The Reaper Forums if you do decide to go with Reaper.
Hope that makes sense to you?
Ps,
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