site_archiver@lists.apple.com Delivered-To: pro-apps-dev@lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:from:to :content-type:content-transfer-encoding:mime-version:subject:date :x-mailer; bh=j03PaBdaqaQ3Q/0fVtdbrOwlZDC6ckufpadw3LtvLGA=; b=Rf2F5HWGQyKQd/dA/4fNYPJ8uKaFE8XppxY09yzB5m6qhM63HJ94Z5iaKhnWtlNRiY Zv3DVHV6CgRKcFG0/yKGCoNsziyz7vOsH2MAZkX0rO1eq1pQcIjSJoLPitxjqM32dnzO TWEwcm/ElDtZk09sJSUOljPLuQ137qPFsQ3go= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:from:to:content-type:content-transfer-encoding :mime-version:subject:date:x-mailer; b=wEQU/Aam2Ar/8x6fj45sKL2ydP8otM1rg5/X3hqFcvZ26LCgtGH/R5ytWLbdC+E6YZ uZhkdVbcONU9lVgBwXxDpVH4cIK3YgQBWVvq2zX0RfTXtskATH3J4hoTCOxrTII0qmQo xc0Pd7uT5uG+pywDLPG/Yj4to5Ro9hJida1Oc= Two questions: --Daniel _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.ap... My application will do automatically change the (HAL/preamp) input volume, and adjust for this later in the playback process. I could use some advice about how best to accomplish this. To take a simple example: During recording my input AudioUnit determines that the volume needs to be higher. So I change the HAL input volume (not the recorder trim value) up by, say 6 db at time t. (I know most devices don't support this yet -- but the built-in mic does, and I'm working with manufacturers on getting their support.) Later, during playback, from time 0 to time t, I will add automatically add 6 db gain to the audio. I need only record the time (t) and the delta in volume (+6db) during the record process, and I need to get this information back later during playback or processing. Not a lot of data. Questions: 1) Where can I store this volume adjustment (time/db) information? In track automation? in some data chunk in the wav file? In midi somehow? 2) Can an AudioUnit access HAL objects? For example, the audio unit usually has an opaque input source. Can I discover what that source is and operate on it? 3) Does apple provide SDKs for GarageBand and/or Logic so I can provide (non AU) plug-ins, if my product needs it for ease-of-use? My eternal gratitude to the soul who is able to set me on the right track :-) This email sent to site_archiver@lists.apple.com