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Hi,

I’m trying to create an fmod project to run in an iphone application. I’ve got 5 audio files, one per layer, and would like them to play simultaneously. Two parameters are controlling how much you hear of the combination of the 5 tracks, which have volume effects controlling each of them. However, for some reason (even though the audio files have the same start points in my DAW) they play out of sync in fmod. Any ideas why that would be?

Also I’d like to build this project for iPhone and am not sure what the best format is – they are typically longform samples (ie a few minutes each). Can anyone advise what would be the best workflow so that we end up with the smallest package and the highest audio quality.

Thanks very much.

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There is no garuntee that all the layers will start at exactly the same time. To keep them perfectly in time you can combine them into an multichannel interleaved sound. There is an excellent video tutorial by Jeff Schmidt demonstrating this technique:
http://vimeo.com/10083148

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Thanks Peter! Helped a lot. Now have it all in sync. As for the iPhone output format, which would you recommend?

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Am trying oggs at the moment to get the filesize down. Does a wavetable have to be built or can fmod just play the ogg?

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FMOD Designer will encode the your sound data. The encoded sound data is in the FSB file, FSB is our custom file format. It supports the following encodings:

MP2, MP3, Celt, ADPCM, PCM

You can choose which encoding to use in the ‘Banks’ tab of Designer. There are various trade-offs between the different formats.

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Great, although it only seems to allow me to encode in PCM. Selecting any other format brings up an error:

cannot initialize encoder, libmp3lam.dylib is either missing, incompatible or invalid

Is there a way to fix this?

Thanks again.

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