I know about the "formally self-taught" thing and have tried googling this work without success. Could someone please remind me of the title and author of the classical method Jaco referred to a couple of times? I don't remember where (although it was possibly on the 'Modern Electric Bass Video', which I no longer have a playable copy of - it isn't mentioned in the text and transcriptions). As far as I can tell, it also wasn't mentioned in the Milkowski biography. Jaco used it as a reference work for arpeggio exercises and the like and it was possibly written for cellists. The author had a possibly eastern European name, as far as I can recall. Thanks.