EasySynthesis app for iPhone and iPad

Features:
- You can use the Low pass filter which passes signals with a frequency lower than a selected cutoff frequency.
- And use the Resonance which is an additional controlled amplification of that cutoff frequency, creating a secondary peak forms and colors the original pitch.
- You can control volume with Amp button.
- You can control ADSR envelope. ADSR is the Attack, Decay, Sustain and Release of a sound.
- You can learn these parameters work tapping and sliding button sideways.
if you want to quit this mode, you just change soundselector.