Yes, exactly...I think 4-fa is perfect for long-lasting stimulation that gets rid of ADD/OCD and gives you clean, creative focus! It is helping tremendously with web design work, so I have a feeling it would work great for producing music (which is a definite passion of mine)
low dose meph + 4-fa = euphoria and high productivity; the most productive I've been in 5 years!
low dose dxm + 4-fa = productive introspection; putting your insights into action, instead of just feeling insightful ... not a social combo but great for organizing / goal setting.
4-fa + mdma = ??? I have not tried this combo (yet) but here's my intuition on it:
I bet at low doses this would be perfect for resolving emotional issues, and at more recreational doses it would probably qualify for the feeling of "ecstasy". Meph+mdma is absolutely fantastic but meph wears off pretty quickly putting you in re-dose mode...but I bet if you're going out you could do 4-fa+mdma and party the night away and never think about a redose (especially if you did piracetam to extend the effects)