Your gui is great, keep it simple. I would consider adding a default option in the presets so when people play with the eq and freak out because their speakers are blown out or the sounds gone they can just select default to return to normal. It might seem silly but for people who have never used an eq they will not use AlsaTune ever again.

I've incorporated AlsaTune into jack-bridge and it looks great and works great. The changes are on github. Thanks for showing me. I linked to to your sourceforge. I'm pretty keen to add a record feature to your gui.

@swanson I signed up to the reaper forum but I'm still locked out from posting. Feel free to share it there if you like. Honestly this is the only forum I've ever posted in and looking at the reaper one it was pretty overwhelming, I wouldn't know where to start.

As for using reaper I use it with jack and my external audio interface. My set up is preferences/audio/device then select jack and add as many inputs or outputs as you like. Make sure auto suspend pulseaudio is selected, it should be by default if you've selected jack. Then in qjackctl settings I choose my external audio interface, sample rate 48000, Frames/Period 128, Periods/Buffer default. this sets the latency at 2.67 msec which is just insane. If your computer and interface can handle it, if not try setting Periods/Buffer to 2 and if you're still having pops and crackles increase the Frames/Period to 264. Also in qjackctl make sure   server synchronous mode is ticked, Realtime is ticked and Driver is set to ALSA and for midi driver i select seq. Apply and start jack. Every time you want to change a setting you have to stop jack. Then whatever you are connecting to reaper in qjackctl graph just link it to the reaper inputs and it will show up in the drop down menu in your track to select it. Reaper really is an awesome program.

This jack-bridge script uses jacks recommended settings and because it's your default sound system reaper automatically detects jack and you don't have to do anything except if in the reaper preferences/audio/device add as many inputs and outputs as you like and connect them using the graph and the to automatically show up in your tracks.

I put together a little demo video on youtube https://youtu.be/7aFa1ONsGz8

Finally convinced the misses to install linux a few days ago, she's got a dell inspiron. Not sure what model but its got an i3. Put devuan 5 with xfce on it and she wasn't happy until I turned the touchpad on in the mouse/touchpad setting and i haven't heard any complaints since. The thing that impressed me was that it's also a touchscreen, you can use it like a tablet and the little time I had on it, it just worked. The great thing is you can try one or try them all. For me xfce is great and it is not hard to customise it.