Thank you so much cnd!! It is great to meet someone with knowledge of the Lamont history!
I had read some of the old Lamont History books in Library HQ at Sandbank, also some stuff down at the Lamont Museum, run by Mary Lamb, in the old manse of (former) Inverchaolain Church - - had also asked local pipers and The Piping Centre in Glasgow - to no avail.
I do think that some of the tunes will have been lost, probably having been transmitted orally. died with the people who could sing or play them?
I would really like to source an old Lamont associated tune that I could perhaps use or modify to set with the ballad I have composed about the Lamont Massacre at Toward Castle and Dunoon.- It does seem unlikely that any music from 1640s still exists......?
I'll check out the sources you mention - who knows, perhaps a fragment will surface,,,,, fingers crossed!
(a few years ago I composed The Ballad of The Death of Baron McIntourner who was murdered in 1685 on the Larach between Craighoyle and Whistlefield, near Ardentinny. I just made up a tune, was fortunate enough to find some fragments of Gaelic telling of the incident.)
There is more info about The Lamont Massacre - but sadly not much access to music of the time (so far...)

Shall post the Lamont Ballad as and when I get it completed! Thanks for responding.