Studio One 6.5 Signal Flow:

Description/disclaimers:
This is not an official document from PreSonus but is meant to help understand the standard flow for routings, control, and gain staging purposes. It was made through observations using PreSonus signal generators, meters, and scopes.

As always if anyone finds an error, I will be glad to update the flow.

The primary flow is left to right and Audio and MIDI flows have been separated for ease of reading.
New/Changes in Signal flow are highlighted in red
Summary of Flow Changes:

• Input
• Spatial audio recording with up to 1-16 interleaves channels per Track
• Mixing
• NEW Surround Panner and Spatial Object Panner
• Support for 3rd-party Panner Plug-ins
• Surround Panner in Sends
• Updated plug-in set with multichannel support
• Speaker mapping for native and 3rd-party plug-ins
• Flanger/Phaser with additional surround modes
• Surround Chorus
• Updated Mix Tool with multichannel level controls, mute and solo options
• NEW Surround Delay
• NEW OpenAir2 convolution reverb with location images
  
• New impulse response library with true 7.1.4 HDIRs
  
• IR Maker supports up to 9.1.6 for capturing custom impulse responses
  
• Studio One Remote 1.8 Update (Spatial Panners to allow you sit in sweet spot of surround speakers)
• Outputs
• 2-16 Audio Outputs on the Main Channel
• Integrated Dolby Atmos Renderer
• Parallel headphone output for Binaural monitoring
• Extended export/mixdown for multichannel audio
• Dolby Atmos (ADM) export with multiple simultaneous downmix formats