I use a two bath developer when making enlargements. Both developers are from Tetenal; the first bath is Dokumol and the second is Centrabrom.
Unlike the advice from AA concerning 2 bath developers, I like to use the higher contrast of the two as the first bath, which in my case is Dokumol. Depending on the image, I let develope in the first bath until the blacks are about 60-70% done, then transfer into the softer working Centrabrom (the Tetenal version of Selectol soft), and let the highlights further develope.
I tried it the other way around, and got nothing but muddy looking prints. This is a great developer combination which really gives additional control to the final contrast/appearence of the enlargement.