Haha, yeah the 90s were a great time for tracker users on IBM PCs. No effects at all, and to make a booming Bassdrum you just sampled one from that pure drum intro of some techno CD.
Whee, despite you're not a renoise user, I think you approach the problem in a totally wrong way. The idea to make exactly the same as the scooter people did to punch their techno stuff is not only very naive, but also impractical. Unless they tell you (or everyone) how exactly they did their booms. Always remember, you've called it "top secret methods", those methods _are_ musicians secrets, the more valuable the more money by bassboom-advantage you make from them.
Just try to make your own techniques by experimenting cleverly and learning by ears (most important, really!), soundwave plots and spectrograms what each effect does. The bassdrums you've put up as videos don't have to be 909 samples at all - there's many different sources to get such boomy drums, even dedicated synths that'll let you tweak lots of parameters of the basic sound. The rest sounds to me like, well err could be an idea, but doesn't have to be...clever effection, i.e. have some boomdrum, compress and eq it clever to make the dynamics have the right envelope, overdrive, hp filter, distort the wave crossover impulses, eq the grittle hard to make it more subtle, do silly stereo tricks to the higher frequencies, mix back to the basic bassdrum sound after inverse amp modulation to make the grittle behave to the way the ringing oscillates, sample that shit and use it for your oontz, with even more compression and eqing to make it loud as can be despite of other instruments in the same track being almost so very loud.
maybe something wicked like this even. One track actually seems to combine the low bass to the bassdrum with some distortion pathway. This sounds interesting, but given the very commercial context it's probably just a trick to let the tune sound ok on speakers with very little bass power. Or just eq, the right overdrive box, compress, eq....try all such stuff for yourself. If you want to learn techno style very refined Bassdrums, there's lots of video tuts on youtube from people showing their complicated methods - be dazed and confused how many steps many people apply to their kicks, each with subtle effection, and lots of lots of resampling the steps in between.