In the middle of last night I was devising an exercise for WAV whereby he played a scale on his plastic thing and then repeated it, stopping at various intervals to insert a vocal note, until he was comfortable about hitting the notes accurately at whatever point in whichever scale he played.
(Actually, it might seem obvious to most people here that he ought to be practicing scales and arpeggios on a daily basis anyway, though doubtless he considers himself above all that so it would be a complete waste of time to recommend it).

I have just been introduced to a performer called Bishi who is described on MySpace as "folk/glam/powerpop". Someone said she's a bit like Abba, but no, they were always in tune (if nothing else). Possibly it could be arranged for she and WAV to meet up and sail off cacophonically into the sunset.