Gsinth 2, available together with Gsinth 1, was created and maintained by Graham Yeadon. Gsinth 2 is a cross-platform, 3-oscillator realtime VST software audio synthesizer ported to the linux platform. It is available as part of a package that includes a host of plugin effects as well (Gchorus and Gdelay were also used in the demos above). The entire package is available at the link below.
Gsinth 2 consists of a straight-forward GUI that includes separate detuning, attack, decay, portamento and noise parameters for each oscillator. The first oscillator provides the fundamental tone, and the other two oscillators can be detuned upwards from this fundamental as partials. An LFO section is available, which controls the overall output level. It syncs to the DAW's tempo. (As I tested this synth in Carla and not a DAW, the LFOs were not available.)
Gsinth 2 differs from Gsinth 1 in that it includes not just sine waves, but also triangle, saw and square waves, as well as noise. A randomizer button is also available. Holding down the Shift key while randomizing will produce less extreme randomizations. There is also a Porta Reset dial, which controls the amount of time passed before retriggering. Lastly, an Auto-Level button is available, which serves to limit the main audio level to -3 dB.
A few presets: Patches 01 The presets in this tarball were made running Gsinth 2 in the Carla Plugin manager, available in the KXStudio repositories. You will need Carla in order to be able to use them.
Gsinth for linux at GVST