# Bus Instance Limiting and Virtualization

**URL:** <https://qa.fmod.com/t/bus-instance-limiting-and-virtualization/14591>\
**Category:** FMOD Studio\
**Created:** [April 19, 2019, 6:10pm UTC](https://qa.fmod.com/t/bus-instance-limiting-and-virtualization/14591 "2019-04-19T18:10:30Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![iturner](https://avatars.discourse-cdn.com/v4/letter/i/f05b48/32.png) [@iturner](https://qa.fmod.com/u/iturner)\
**Post date:** [April 19, 2019, 6:10pm UTC](https://qa.fmod.com/t/bus-instance-limiting-and-virtualization/14591/1 "2019-04-19T18:10:30Z")

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Regarding the documentation:  
[8.2.2 Bus Instance Limiting](https://fmod.com/resources/documentation-studio?version=1.10&page=mixing.html#bus-instance-limiting)

Is the section describing the various stealing behaviors referring to the stealing behavior of the Group Bus? If so, why is Virtualize missing from the dropdown (Group Macros) in FMOD Studio (1.10.12)? Or is it referring to the Event Instance stealing behavior?

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**Author:** ![Skaven252](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/skaven252/32/63_2.png) [@Skaven252](https://qa.fmod.com/u/Skaven252)\
**Post date:** [April 21, 2019, 10:20am UTC](https://qa.fmod.com/t/bus-instance-limiting-and-virtualization/14591/2 "2019-04-21T10:20:46Z")

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Virtualization only works between multiple instances of the same event, because they are identical thus their distance volume attenuations can be easily compared. A mixer bus contains multiple events with different volumes and distance attenuations, which would make virtualization too complicated to crunch every frame.

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**Author:** ![iturner](https://avatars.discourse-cdn.com/v4/letter/i/f05b48/32.png) [@iturner](https://qa.fmod.com/u/iturner)\
**Post date:** [April 22, 2019, 1:05pm UTC](https://qa.fmod.com/t/bus-instance-limiting-and-virtualization/14591/3 "2019-04-22T13:05:44Z")

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I see. So the documentation that I linked to must be talking about the stealing behavior of Event Instances even though its in the Group Bus \ Group Macros section? Is it safe to say that the Group Bus stealing behavior has no affect on the Event Instances being mixed through that bus (aside from limiting what is actually being mixed)?

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**Author:** ![richard\_simms](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/richard_simms/32/261_2.png) [@richard\_simms](https://qa.fmod.com/u/richard_simms)\
**Post date:** [April 24, 2019, 4:49am UTC](https://qa.fmod.com/t/bus-instance-limiting-and-virtualization/14591/4 "2019-04-24T04:49:06Z")

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It looks like the documentation contained some errors. As mentioned virtualization isn’t possible at a bus level, but you can use Furthest.