Fix bugs w/ pos

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Description

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PR Checklist

• [N] Did you format your code using format.bash?
• Does the VST3 plugin pass all of the unit tests in the VST3PluginTestHost? (Download it as part of the VST3 SDK here.)
  • Windows
  • macOS
• [N] Does your PR add, remove, or rename any plugin parameters? If yes...
  • [N/A] Have you ensured that the plug-in unserializes correctly?
  • [N/A] Have you ensured that older versions of the plug-in load correctly? (See Unserialization.cpp.)