Two tracks, each one twice: as the groovebox was before, and with the change. The notes are the same in both; only the level of the lead sound moves. Under each pair is the lead by itself, before and after, which is the clearest way to hear what changed.
Nobody has listened to these: they were made and measured by a program, not heard.
The same track and the same 16 bars in every clip, 37 seconds.
The lead is a Koto. Before, it sat 33 decibels under the whole mix; after, 24. It can come further forward still: that is one number.
The same track and the same 16 bars in every clip, 35 seconds.
The lead is the sound called Zap sequence, the most played of the twelve. Before, 22 decibels under the whole mix; after, 17.
In the whole track clips: can you now pick the lead out, and does anything else sound louder or harsher than before? It should not.
If the Koto is still too far back for you, say so: how far forward it comes is one number.