Contacted support. Received a prompt response but no solution yet. Sounds like the issue is that the Transfer app looks at the sample on the RYTM and compares its sample header against its actual sample data and it doesn’t think the samples match their own headers. So either something got corrupted on the synth (unlikely, all the samples work fine), or it’s some sort of mismatch/bug with how the samples got loaded onto the RYTM (possibly with the old C6 app), how Transfer is trying to read them, or the version(s) of the RYTM OS used at the time of loading the samples.
I’m really concerned I won’t be able to this data off the RYTM. I was thinking of upgrading to a MK2 but if I can’t transfer all the samples over then I’m not sure I’d be interested in doing that.
I’m curious if the old C6 app would be able to read the samples correctly, but I’m also concerned that the C6 app might end up corrupting something in the process. Probably not going to try this.