# Synth app loading problems

**URL:** <https://forums.steinberg.net/t/synth-app-loading-problems/861395>\
**Category:** Cubasis\
**Created:** [July 29, 2023, 4:29pm UTC](https://forums.steinberg.net/t/synth-app-loading-problems/861395 "2023-07-29T16:29:20Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![LSlowak](https://dub1.discourse-cdn.com/steinberg/user_avatar/forums.steinberg.net/lslowak/32/2_2.png) [@LSlowak](https://forums.steinberg.net/u/LSlowak)\
**Post date:** [August 1, 2023, 10:03am UTC](https://forums.steinberg.net/t/synth-app-loading-problems/861395/10 "2023-08-01T10:03:24Z")

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Hi @motreg,

> Can I expect cubasis 3 to load synth app data etc.?

Basically “YES”, but it often depends on 3rd party plug-ins (instruments/effects) in use and the chosen format (Audio Unit, Inter-App Audio), if these do load properly.

Apple introduced Audio Unit support many years ago, which provides much greater options and clearly can be seen as their successor to Inter-App Audio. Therefore, we strongly suggest using AU plug-ins where possible.

Below please find our dedicated articles, with additional infos about AU and IAA.

[Limitations of Inter-App Audio](https://forums.steinberg.net/t/limitations-of-inter-app-audio/80516)

[Limitations of Audio Unit](https://forums.steinberg.net/t/limitations-of-audio-unit-extensions/70412)

In regards to Inter-App Audio, it makes sense to first launch the stand alone app versions of the plug-ins in use, before launching Cubasis and the project using these plug-ins.

In addition, if 3rd party plug-ins fail to load within a project, simply shut down and restart Cubasis which often helps too.

Stay well,  
Lars

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