Unidentified tracks from a Boards of Canada mixtape

[sixty]

Hi there,

I'm interested to know if any members here are able to identify a few unidentified tracks from a mixtape curated by electronic music duo Boards of Canada.

https://mega.nz/#F!bKYU2IaQ!GTiZ4NiAyzXQR1fc5MMEHQ

Track #1 - piano, drums, synth and choir
Track #2 - bass, synth, drum machine and piano
Track #3 - ambient piece with only synths
Track #4 - fretless bass, piano and synth
Track #5 - ambient piece with only synths
Track #6 - strings

If anyone's heard these before even a label or artist would help greatly! Thank you.