iOS: Sound generation on iPad given Hz parameter? -

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is there api in 1 of ios layers can use generate tone specifying hertz. i´m looking generate dtmf tone. link explains how dtmf tones consists of 2 tones:

http://en.wikipedia.org/wiki/telephone_keypad

which means should need playback of 2 tones @ same time...

so, exist:

somecleverplayerapi(697, 1336);

if spent whole morning searching this, , have found number of ways playback sound file, nothing on how generate specific tone. know, please...

check out au (audiounit) api. it's pretty low-level, can want. intro (that gives need) can found here:

http://cocoawithlove.com/2010/10/ios-tone-generator-introduction-to.html


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