Featuring four waveforms and dynamic frequency and volume control, Modulo is a real-time audio tone generator. Enter a frequency or simply drag the bar to adjust the pitch of the signal. Featuring sine, sawtooth, triangle, and square waves, Modulo also functions as a single oscillator synthesizer. Modulo is available on the Google Play Store for Android 4.0 (ICS) and up: https://play.google.com/store/apps/details?id=com.modulo