Pulsation Lite allows you to explore pulse wave synthesis in a simple and easy to use manner, included are tuning, pulse width, effects and modulation options to further shape the sounds, although limited to pulse wave synthesis you can create a wide range of sounds and it is free so give it a try and see if you find it useful.

•4 pulse-waves each with LFO and ENV modulation options with visual graph for waveform shape
•4 stage ADSR amplitude envelope with visual graph for envelope shape
•Keytracking filter with low-pass, high-pass, band-pass, band-reject, and peaking configurations
•4 stage ADSR filter envelope with visual graph for envelope shape
•Tempo-syncable sine, saw, square, triangle, or noise LFO to modulate filter and pulse-widths
•Multi-effect delay, chorus, and distortion each with toggles and mix knobs
•Easy 1 knob velocity adjustment and modulation wheel amount adjustment
•Pitchbend range from -12 to +12 steps
•Tune from -5 to +5 octaves and 12 semi-tones per octave adjustment
•Free VSTi

Download Pulsation Live V1.00 here