Okay, I did just steps one and two of that planned combination (98 mg DiPT, followed by 80 mg Methylone at t+5.00 hours). The Methylone was rather later than I originally planned (I was cognitively at baseline, and auditorily in phase 2 or 3 (the interesting closed-ear audials had faded to mild high-pitched noise, but perceived nonlinear pitchshift, of on average 2 or 3 semitones, was present)). I don't think the Methylone influenced the remaining DiPT effects at all, when taken in this order: there seemed to be no reincreasing of auditory or cognitive effects in its wake.
It's hard to say if there was any interaction in the other direction, of DiPT moderating the effect of Methylone, because I've not previously taken 80 mg Methylone (a jolly low dose) on a stomach that's had virtually no food in it in the past 10 hours. Anyway, the effects of the Methylone dose were notcieable (whether they be main effects or an interaction), and had a timecourse comparable to what I'm used to at a range of doses: t+20-50mins - warm euphoric empathogenic come-up; t+60mins onwards: jaw clenching and stimulation; but these were very much milder than I'd expect from a larger dose of Methylone, of course, and I could sleep from three hours after the dose (never possible for me at higher doses until at least six hours).
So it looks like DiPT and Methylone with this dosing regime have not much interaction; the one just overlayed the other.
I collected a fair amount of data at each of three octave ranges (around 440Hz, and the two octaves below it) this time, so I'm hoping I will have data that can speak to the perceived nonlinearities of pitch shift.
I also managed to go outside! ... albeit somewhat post-peak. I'd really like to experience the peak effects outdoors (in nature, ideally), but that would - for me - entail being outside from the start of the trip, I think. Which could be quite a challenge, in various ways.
I'll put up a trip report with, I hope, more detail and the quantitative results, some time in the next week.
By the way... regarding rolling out the DiPT perception experiments to other people... I've had little response (just one person) from people trying the pilot experiment: I don't know if this is because of people not having the time (or inclination) to run the program at all (yet); or if people are put off by the task sounding difficult (and apparently depending on perfect pitch; although it really doesn't... I've had data from someone who thought they had no pitch perception at all, but they produced data that suggested they were perceiving accurately, albeit not very precisely... however, I think it probably does depend on having some knowledge of note-names and some, even if very little, experience of hearing or playing music while reading the note names). Either way, I think the best thing for me to do would be two-fold:
1) Continue running the raw pitch perception experiment on myself, to map out in as much detail as possible the sort of stretches and shifts involved; and, once I've mapped that out, write a new program that will allow the participant to twiddle knobs that produce those stretches and shifts (with varying size and direction), and present them with a familiar piece of audio (a snippet of a song, say), distorted, and ask the to twiddle the knobs till it sounds normal again - a nulling paradigm for the nonlinear pitch shift, that should - I think - be an easier task than the absolute perception task;
and 2) In the mean time, distribute a final version of the pitch-shift program I'm running on myself anyway, despite the lack of response to the pilot study, in case anyone does get the chance to do it while on DiPT at some point.
