I've got the Martino book that Barry recommends (Linear Expressions) and that he based his Five Activities on in the Pat Martino PDFs. But Pat uses one set of numbers that I don't understand. You can find them in those Five Activities in the Pat Martino Lessons set under Topic Driven PDFs. There are many more examples in the LInear Expressions book itself. There is a set of usually six digits, 1 though 6, in circles under the notes in the transcription of his activities. But I can't make sense of them. They do not correspond with the 16 digits in the diagrams on the schematic fretboard underneath the musical transcription of the Activity, and they don't even correspond to each other in the various Activities. Any hints? Barry? Anyone? 6 of what? I only have 5 fingers, and I only use 4 of them, really.