DTMF Tone Utility play online

DTMF has tree modes:
-Normal: In the normal-mode tones plays as you press the buttons in the app. The time the tons plays can be specified.
-Queue: In the queue-mode a queue of tones can be made. This can be done by pressing the tone buttons, writing a CSV with tones, or by use of the random tone generator.
-Hold: The hold-mode keeps playing the pressed tone until the tone is pressed again.

This is my first app. If you have any proposals for things to add to the app. Please send them to me.
If there is a crash please send the crash report. This would be a great help.