DTMF Pad Tone Generator - 1234567890*#ABCD, set duration and tone/silence ratio. Available on Amazon Appstore and Google Play: This app will give you a DTMF tone pad and the ability to generate custom DTMF sequences, set the duration and tone to silence ratio. Includes the characters 1234567890*# and the menu tones ABCD. You may enter a custom sequence via the keypad, soft keyboard, or speech if your device already has speech-to-text capability. This is basically a touch tone telephone keypad, which may be of interest to amateur ham radio repeater operators.