I know, I know....twas a bad timing, I was planning on taking my share home; kinda wasn't kosher at that stage, so I just downed it with a beer. I actually found that the sounds of nature frighened/alarmed me the most; I really found it quite difficult to 'place' myself in an environment. I think because I've been playing/making music for so long I may have sensitised my hearing somewhat....
But if I get a chance to consume again, it will be a lower dose, 40-50mg, and I think having eyes shut the whole time and sitting on a grassy knoll in the bush listening to birds alien tweeting. But I think EYES SHUT could be essential; I have a feeling that more visual aspects will become noticeable if I restrict my brain from external sources and allow the pitch effects to maybe create some synaethesia. One thing to any who consume this in the future; if you have a didjeridoo or recordsing of one, play/check them out. That was by far the best 'sound' of the experience.
Personally, I will specualte that the pitch shifting is perceptual; maybe a more circituous route is taken by audio signals resulting in an increase or decrease in the cycles (sample rate) of the sound source. Most pitch shifters, which can drop pitch and retain the correct timing information do so by removing portions of the audio, or to raise pitch the fundamental frequency remains intact and the harmonics are shifted upwards. I didn't feel that DiPT effects much beyond the region where humans hearing is at its finest; 1-4khZ; the vocal range. That said, we get so much information from the region, distoring it changes everything really.
I wonder what it would be like to consume in an anechoic chamber; a room for testing specilaist audio and other equipment that has no reflection or reverberation; the effect of entering such a room almost makes one fall to the floor; very hard to orient oneself. Interestingly, carbamazepine lowers pitch by one semi-tone; recent article in New Scientist in regards to that. I am going to write in mentioning the effect of DiPT- I already wrote to Dr Oliver Sacks, but I didn't get a reply.