The OP-X Free has got the same basic engine and sound as the full OP-X while the available presets are limited to a few chosen ones and the GUI only gives access to a few parameters. Most comprehensive detuning options available!
The OB-X saw the light of earth in 1979 and was the first fully programmable polyphonic synth built by Tom Oberheim. It’s the direct successor to the famous SEM based units. The secret of the OB-X is that it still has the old discrete 12db SEM-filters. All later units such as OB-Xa, OB8 and Matrix as well as many competing products made the use of the more sterile Curtis filterchips. This fact makes the OB-X one of the best sounding polyphonic synths of all time. Experts put the OB-X in the same league as the Memorymoog. We love this synth!!