Hey folks,
We have many audio-focused courses freely available on Unreal Online Learning.
This month, the Quartz Music System course was released. Some other audio courses; Audio-Driven Gameplay, Ambient and Procedural Sound Design, Sound and Space, Dynamic Audio, and Understanding Audio Mixing and Effects. There are some additional courses such as Blueprints and Gameplay for Game Designers that have elements within the course that could be of assistance.
Some other content that you might find of interest: MetaSounds and Quartz | Inside Unreal
It might also be of value to check out Dan Reynolds Audio; they have tonnes of audio-related content on their Youtube channel.
As for Movie Render Queue / Sequencer resources, the Inside Unreal broadcast on the Movie Render Queue Enhancements in 4.26 back in January 2021 has some great insight. As for the wider community, William Faucher has a Youtube playlist on Movie Render Queue Tutorials that I recommend.
With the issue you may be facing for particle effects and MRQ, it isn’t unheard of to have warm-up frames in your render to allow world loading for foliage and even FX. A community member commented on a VFX freezing issue when using MRQ and suggests adjusting your particle emitter settings.
I hope some of these resources help and point you in the right direction for a solution to the issues you may be facing and give some extra insight into the features. Happy developing!