There's no definitively dangerous interactions between Tramadol and the tryptamine and phenethylamine psychedelics. The problem with tramadol is that it lowers the seizure threshold, so it's possible it might make you more sensitive to some of the effects of psychedelics, such as sensory feedback etc.
A friend of mine once took a load of tramadols and then a moderate dose of 2C-T-2. He had a bad/confusing trip which ended up with him in A&E because he couldn't handle the intensity, and he said he couldn't remember most of it. This doesn't really say very much though, because he tends to have a lot of dark and unsettling experiences.
I would just keep the dose of your chosen psychedelic on the low side in order to see how you react with it.
Have a look here for further reading:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2714818/