Michael Picher has released Pocket Synth, a free virtual instrument that can be loaded in the freeware Sforzando SFZ player.
Have fun playing around with the countless possibilities of this mini synthesizer! You can mix and match the two voices (saw wave), using the pitch and x-mod controls, and then further refine the sound with cutoff and resonance effects.
Pocket Synth is a virtual dual oscillator analog synthesizer with pitch, x-mod, cutoff, and resonance controls. It is compatible with Plogue Sforzando free SFZ player (standalone & VST/AU/RTAS/AAX plugin). You can download Sforzando for free here.
More information: Michael Picher