Ok that makes way more sense. Well, first, you will never escape the set curve of the logarithmic potentiometer so the best you can do is work around it. I guess you could interpret the curve as the speed with which and under what behavior a potentiometer will increase the volume. A linear potentiometer steps up incrementally in even portions throughout the entire turn of the pot’s wiper, a logarithmic or “audio” curve is meant to mimic human hearing which means that the lower part of the pot usually moves a lot slower and then very quickly increases in volume after you get to a certain point in the rotation, and I think that’s part of the issue that you’re dealing with (at least from your description).
An elektron device at max volume is supposed to be outputting line level audio, so the analog volume pot is just an attenuator which brings the output down from line level. Generally, line level is where you want your volume at for recording and mixing with other devices which is why they’re suggesting that you use a higher volume on the syntakt and a lower volume on the mixing device.
Somehow, I already assumed you weren’t using a mixer from your initial statements which is why I suggested using track levels until the volume pot position is relative to your desired “mix” volume. It’s not a good practice to do this in general but I think for you, it’s the closest you’re going to get without adding a small mixer either in-line between your devices to further attenuate the level, or a larger mixer which you run your rc-202 as well as the syntakt into.
If you want to try it with adjusting the track levels, just make sure you don’t save the project after the adjustment so that you can always reload if you aren’t happy with the results. If you do notice the volume pot bunching up at a certain place though, where it seems really difficult to adjust the volume from there on up, that is likely due to the logarithmic nature of an audio pot, and I’m almost positive elektron uses logarithmic analog volume pots as it’s a pretty standard practice on audio devices of all kinds.
I hope that makes sense, and just so you know, you could score a cheap mini mixer for probably 30 bucks that would make a big difference in your situation.
You could even use something simple like a Y cable to an in-line attenuator as opposed to a mixer, just make sure it passes stereo signal. They’re also small and inexpensive and you could use that as your mixing knob as opposed to the syntakt volume pot (just leave that one alone and in place).
like this:
You have options, but without additional hardware your options are a bit limited as there’s no setting which will change the max output.
Hope that helps? Someone else might have better advice so let’s see what happens.
edit: maybe you could run the rc-202 audio output into the syntakt’s inputs and instead of using the volume pot to do the transition, you could use the syntakt mixer page? I think the digital level change should be linear instead of logarithmic so that might make it easier, but it would be a little fiddly. Probably no worse than what you’re doing now though, and then at least the volume crossfade could all be done from the same device (syntakt) since all you’re doing right now is adjusting audio levels. Something to consider at least.