Crackling Artifact When Using RNBO Export in iOS App

[Symphonic-eMotions]

Description:
When playing any note through the RNBO export in my iOS app, an audible “crackling” artifact occurs. This happens with all example patches and significantly degrades the audio experience.

Environment
RNBO Version: 1.4.1 (Trial version)
Max 8.6.5 (Full version)
macOS: Ventura running
Xcode Version: 16.3
Tested iOS Devices:

• iPhone 16 Pro (latest iOS)
• iPad Mini 1st Gen (latest iOS)

Steps to Reproduce

• Open the project in Xcode and deploy to an iPhone or iPad.
• Launch the app and play notes using the on‑screen keyboard interface.
• Observe the audible crackling artifact on every note.

Expected Behavior

• Seamless audio output without crackling or added distortion, matching the sound heard in Max.

Actual Behavior

• Crackling/distortion artifact audible on every note, regardless of the chosen patch.

Additional Information / Investigation
The same patch plays cleanly in Max, without any artifacts.
Suspect a sample‑rate mismatch or buffer‑configuration issue in the export implementation.
Unsure if the trial version introduces this artifact or if it’s present in the full commercial build.

Question:
What is the most likely cause of this crackling artifact, and how can I resolve it so that the audio output matches the clean playback in Max?