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Hello,

Using the old event system (as opposed to the new music system) we are having a really hard time getting looping music tracks to stay in-synch.

We have one event with a number of different layers (say 4 or 5) all of which are either the same length or sample accurate equal divisions. All layers start at the same time and we use volume to on a paramater to crossfade and build the loops.

Shoyuld this work? If it doesn’t What should we be doing ?

Thanks in Advance

Nick.

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[quote="Narundel":3efbzwp1]Hello,

Using the old event system (as opposed to the new music system) we are having a really hard time getting looping music tracks to stay in-synch.

We have one event with a number of different layers (say 4 or 5) all of which are either the same length or sample accurate equal divisions. All layers start at the same time and we use volume to on a paramater to crossfade and build the loops.

Shoyuld this work? If it doesn’t What should we be doing ?

Thanks in Advance

Nick.[/quote:3efbzwp1]

I’m not surprised that the loops on different layers are starting to drift over time and lose sync…as there is no real synchronization (time code, or whatever) to keep each interaction of the loop in sync.

I’d suggest instead of using multiple layers, using a multi-channel audio file with the channel mix effect. This technique is described in the user manual in the section ‘Fun with multi-channel files’. This technique is also demonstrated in the event AdvancedTechniques/MultiChannelMusic which is examples shipped with Designer. FMOD supports up to 16 channel music files.

The technique has the benefit of:

  • being sample accurate (between layers)
  • using a single stream for the event instance.

The only change you would need to do is set the effect envelopes differently to allow the elements of the music to build.

cheers,
Templar

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Multi-channel wav’s can’t be compressed though correct? We play back from memory, and not streams.

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[quote="a1psx":2sbpp50k]Multi-channel wav’s can’t be compressed though correct? We play back from memory, and not streams.[/quote:2sbpp50k]

I’m pretty sure FMOD Ex (and Designer) can handle multi-channel compressed files, such as 16 channels of mp3 or ogg data. See:

The following link has some nice references to tools that allow you to author multichannel files:

cheers,
Templar

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[url:2h6j60dp]http://www.fmod.org/forum/viewtopic.php?t=10088&highlight=[/url:2h6j60dp]

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[quote="a1psx":rmntb6kr][url:rmntb6kr]http://www.fmod.org/forum/viewtopic.php?t=10088&highlight=[/url:rmntb6kr][/quote:rmntb6kr]

D’Oh! There goes the easy option!

I guess this might mean an implementation using the low level API…if sync is absolute priority.

Or,

Just out of interest, have you tried using the Interactive Music System with multiple concurrent themes? Perhaps if you describe what you are doing (PM if necessary), I can suggest a solution using the Interactive Music Tab.

cheers,
Templar

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