Now available is the second edition of the expanded SID-Wizard manual I wrote in 2012. I have added some chapter (about dealing with noise, calculating bpm etc.). The e-book is up to date with version 1.6 of SID-Wizard. Very nice things added to SID-Wizard since 1.5 is MIDI support and A4=432Hz tuning.
If you want to learn how to create chip tunes on the Commodore 64, this e-book may be of help. It’s an expanded manual for the new (2012) and excellent C64 native music tracker SID-Wizard (version 1.2) by Mihaly Horvath.