Easy to recreate, i first heard these baselines back in the 96s days , listen to ramm records speed of sound. If you are using reason open up an initilised instance of subtractor. Use one osc only and change to sign wave , set polyphony to 2, filter fully open and no res at all. Set amp env to give u a gate type ( note on note off envelope) , now change the octave range to 3 or 2. Hold two keys down together exactly ie CandCsharp , and one note should slighty detune from the other play with the pitch bend. U can also do this by importing a looped sine wave in a sampler any two keys directly neighbouring each other works .