1. DXM can get incredibly deep if you let it. This doesn't change the fact that it is disorienting and confusing. You just have to know that the best way to take it is in a dark room with ambient/downtempo music playing, and in no way put yourself in a situation where interaction with the outside world is needed. Having to even change the music will completely take you out of the experience and force maximum focus for even the tiniest of tasks. I would have agreed to it's lack of depth had I wrote this 5-7 DXM trips back in time, but after more experience it's just as deep as MXE and as psychedelics is.
2. Gel caps are the way to go. Every syrup is disgusting and for me it starts the experience off poorly if I'm having to ingest what feels like poison.
3. For dosage, go for the third plateau and use a DXM dosage calculator online to find how much DXM that requires for your bodyweight. Don't go fourth, believe me.
4. As said above, prepare your space with good speakers (good headphones also work, but the feeling of bass resonating in one's body while on DXM is orgasmic and soul massaging), a bottle of water, and anything else that may be necessary to keep you comfortable for a quite some time. Swallow your DXM and turn on the music. Turn off the lights, lay down, and wait for it to come, staying acutely aware of everything going on in your body. There ya go.
Now, as for music. Here is what my DXM playlist consists of that I turn on as soon as I dose, and it lines up pretty damn well for the experience. Recreate this on Spotify or download these albums and create a playlist on iTunes, etc.
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UNKLE - Lonely Soul - only the track, no album
Explosions in the Sky - The Earth is Not a Cold Dead Place
Exist Strategy - Dreamcatcher
The Orb - The Orb's Adventures Beyond the Ultraworld
Mononome - The Secret Melody
Massive Attack - Mezzanine
Massive Attack - Protection
Kruder & Dorfmeister - The K&D Sessions
Thievery Corporation - The Cosmic Game
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Which of course is a lot of music, but if you aren't feeling an album then you can skip it. But this is what I put on literally every time I do DXM or MXE (RIP).
Have fun, DXM is an immensely beautiful chemical if you respect it and understand how to listen to it
EDIT: Yes, and weed is unreal on it. I crave it deeply if I even so much as remember weed exists while on DXM without any.