I released today something special about a very cheap synthesizer for only 99 USD. The synthesizer is based on a square waveform and has different waveforms inside. The power of the synthesizer comes from the USB (USB Version) or directly from the MIDI Interface (Midi Version). Tweaking the sounds is very easy, You can make your sounds in the editor for PC/MAC or also in the Reaktor Editor. Alternatively you can use also an editor for IOS Devices. There are 32 Presets inside but you can store also another 32 User Presets. You can also tweak all the parameters with your classic MIDI CC of your keyboard.
Here is an audio only review with sound examples and all filters: