I spoke to Lyndon Sharp yesterday on facebook (he is currently working on music for the Spectrum Next).
I told him about the bubble dizzy engine being extracted and incorporated into 1tracker 0.26.
He says the bubble dizzy music was actually music reused from a game called rally cross but with 2 re-sampled drums, although he says he likes the drums but can't actually remember doing the tweak
Anyway he said to tell Shiru to keep up the good work
And if he fancied adding these newly found drums to the main kit it would be good
Not sure if he means his original engine?