[swatts]

I don't think you'll see any appreciable difference in conversion quality by switching audio interfaces at this level, particularly with the style of music you are making (which is great by the way, well done!). It all comes down to workflow, and it seems you're getting it done just fine with the Yamaha. I'd look to upgrade if you find yourself needing more inputs.

The more obvious upgrade would be a new microphone to replace the Kenwood you are currently using. An SM-58 will last you a lifetime or if you have a bit more to spend something like an SM7b will be a great investment particularly recording in untreated spaces.

Also, you could try recording the midi information of your electric drum kit and then loosely quantising/editing the takes to retain the feel. You can map these to Logics in-built drums which are pretty great.

Congrats on finishing a body of work, most don't get that far!

[romes]

Thank you for your suggestions, and specifically on the microphone one. I wanted to get a new one but I was having some difficulty choosing a good one for me. I will look into this. And thank you for your nice words!

[swatts]

Yeah going down the microphone rabbit hole can be confronting. It's always best if you can try a particular model before purchasing it (particularly for your own vocals), as microphones are very source specific.

Not always an option depending on where you are, but often you can find an audio-rental company nearby. It's hard to go wrong with the mics I mentioned above though. Keep it up!