DiscoDSP released OB-Xd – a free emulation synth of the Oberheim OB-X, OB-Xa and OB-8 synthesizers.
Oberheim OB-X Emulation Synth
The OB-Xd is based on the Oberheim OB-X. It attempts to recreate its sound and behaviours, but as the original was very limited in some important ways a number of things were added or altered to the original design. The OB-Xd was designed to sound as good and as rich as the original. It implements micro random detuning which is a big part of that sound. ... Like many synths of the OB-X’s generation, the OB-Xd has no internal effects so its sounds and textures can be greatly enhanced by the use of additional processing like chorus, reverb, delay, etc.
From the manual:
A mixer was introduced to blend the two oscillators and noise source which is much more flexible than the fixed levels of the original design. In the OB-X cross modulation (Frequency Modulation), OSC2 modulated OSC1. On the OB-Xd this is reversed: OSC1 modulates OSC2. Sounds created by sync and x-mod this way were judged more useful than the inharmonic results of the original modulation path. The Step switch allows for precise tuning by semi-tone steps. Note that disengaging this doesn't keep the pitch at the precise semi-tone step but resumes gradual pitch adjustment. The Bright control adjusts the clarity of higher harmonics. Detune of OSC2 only adjusts up from the basic pitch (the original was bilateral).
From the manual:
The original OB-X had a single 12dB/octave low-pass filter. The OB-Xd significantly improves on this design: it implements a Multimode 12dB/ octave filter like the Oberheim SEM module. Using the MULTI rotary control, you can crossfade between low-pass behavior on the complete left, to either notch (by default) or bandpass (using the BP switch) behavior at 12 o'clock, and high- pass behavior on the far right. There is also a 24dB mode which is activated by the 24dB switch. This mode is only low-pass, but the MULTI control now allows you to smoothly change the depth of the filter slope from 24dB/octave on the complete left, down to 6 dB/octave on the complete right.
How to Install
You can run the .pkg installer or:
- Drag Obxd.component into Library / Audio / Plug-Ins / Components.
- Drag Obxd.vst into Library / Audio / Plug-Ins / VST.
To install the presets, drag the 'Datsounds' folder into ~/Library/Audio/Presets/.
Download OB-Xd here.