Idk if it will help but there is a setting in RSMods where if you tick the relevant checkbox in it, it makes the game not pause the current song anymore if the RS2014 window gets out of focus (other window maximized, clicking on a secondary monitor, etc) but it's only if the focus is lost during (from my memory) the first 5 seconds since the song started or since you have unpaused the song. So you can start the song and because there are usually a few seconds of leading silence you can alt-tab instantly to your DAW gui without pausing the song in RS, press record or whatever, and go back to RS (or not) as it's still playing.