Isolation doesn't work properly with different rates in R^3

[donuts42]

If I use isolation to select a later section to practice and adjust the rate to be slower, the notes that I play are the right ones, but the song is not shifted correctly to account for bot the rate and the isolation. For example if I used Isolation at not 850 and turned the rate down to 0.7, the part of the song that plays is much earlier than the section the notes are on.