I have a prescription for adderall and not suprisingly it is when the drug is in full effect that I make the most money. You are definitley in a zone under it's effects which is why I try to plan my sessions around it's peak rather than late at night.

I also believe Matusow uses Ritalin (a methyphenidate not an amphetamine) to help his play / keep his mind off cocaine.

If you have any more questions just ask and I will do my best to answer.