Keep practising, don't be expecting a lot while dosing, stay calm and focused on the sounds but make sure you passively focusing on them not activily trying to extract this or that from them. Eliminate the most light on your eyes possible, be as comfortable as you can be, move as little as possible, don't be distracted. After doing a dose I find sitting down quiet on my computer or reading or whatever and not moving a lot physically or mentally helps a ton to feel the desired effects, at this stage gently scan your body and your body with your awareness for any changes in your state of consciousness and body feeling if you detect something, enjoy it. Give it attention, it's a bit like sex, you might be feeling like a million dollars making love to that hot chick but if you completely go to the moon in your head and start thinking about stuff that has nothing to do with what you're doing the pleasure will be greatly reduced. Your mind is a structure you can aim in this or that direction, while dosing remain actively passive, after dosing actively focus on experiencing your new state of mind.
To keep it short I'll give you 3 words: practice, practice, PRACTICE. With time and experience you'll feel amazing effects.
Also I'm still experimenting with this but with great results so far but if you find you don't get any or a lot of effects dosing with your headphones in the right position, switch it up. Try dosing with your headphones in reverse (left-to-right/right-to-left) and see if it helps.
Good Luck.
