I have been doing something similar for a little while, and techno in 88 hp is quite possible, especially if you have other gear too. See for example :
https://www.modulargrid.net/e/forum/posts/index/9056
In my setup Pam's is the heart of everything. To get the best out it you will probably want the Pexp-1 expander. I also strongly recommend getting a switched OR module like the Low-Gain Short Bus or the Ladik S-260. This will turn Pam's into a much more powerful trigger sequencer, because you can use the switched OR to overlay sequences. Pam is also a very capable modulation source, and it can be quantised to pitch to generate melodic loops (your Beatstep Pro is probably a better option for this though!) To make the most of this you will need a CV mixer, and a logic module (e.g. Mutable Instruments Kinks or SSF Tool-box) could be quite handy too.
I am assuming you are going to get more percussive voices here. I second Sacguy's recommendation of BIA - it's very good, and with some creative (clocked!) modulation it can be many different "voices" at the same time. A low-pass gate is a nice thing to have : will let a "normal" oscillator do more interesting percussive things when needed.
I have no suggestions for pads and general ambience, other than to use Disting as a sample player, with loads of delay and reverb. If I had infinite budget I would get the Instruo Saich, but it is very expensive and quite large.
p.s If you haven't already seen it, Mylarmelodies' video about making a tiny techno system has many good ideas.
-- the-erc
Hi the-erc, thank you for your feedback, I'll take a look at the video.
Didn't think about switched OR and low pass gate / vca
Here is the rack after sacguy and your recommandations.
I added MI Kinks, Low Gain shortbus and Make Noise Optomix for low pass gate/vca
BIA is back too :)
https://cdn.modulargrid.net/img/racks/modulargrid_1385725.jpg
Kind regards,
Cédric