Toby - did you use mlord's test Hijack (v329+s) for this?

I'm wondering if it could be timing-related? I know the tuner has to sample within a very small time window, so is there something Hijack could be doing that interferes with the sampling? You (Toby) might be able to test that theory with a longer sampling time (though it would probably be unpleasant to hear, it may tell us something).

Otherwise, all I can think of is memory usage; I'm not sure that would make a difference, but I suppose it's possible...