Engine Running Component

Engine audio from multiple RPM samples crossfaded through an AudioMixer based on engine RPM and load.

Features

• Granular Synthesis: Crossfades multiple RPM samples for realistic engine sound across RPM range
• AudioMixer Effects: Controls lowpass filter, distortion, and reverb via exposed mixer parameters
• Load Response: Volume, pitch, and filter modulation based on engine load
• Smooth Transitions: Configurable smoothing for RPM and load changes

Setup

1. Add multiple audio samples to Engine Samples, each recorded at different RPM
2. Set Base RPM for each sample to match its recording RPM
3. Configure AudioMixer exposed parameters: EngineVolume, EngineLowPass, EngineDistortion, EngineReverb
4. Adjust smoothing for transition speed and crossfadeCurve for blend behavior

Key Properties

Property	Description
smoothing	SmoothDamp time for RPM/load transitions (default: 0.15s)
loadVolumeBias	Volume reduction when coasting (0-1, default: 0.5)
loadVolumeBoostDB	Volume boost in dB when under load (default: 4dB)
loadLowPassBoost	Lowpass frequency boost in Hz when under load (default: 6000Hz)
maxDistortion	Maximum distortion level at full load (0-1, default: 0.5)
loadPitchBias	Pitch increase when engine is under load (default: 0.1)

Mixer Parameters

Configure these exposed parameters in your AudioMixer:

Parameter	Description
mixerVolumeParam	Volume control (default: "EngineVolume")
mixerLowPassParam	Lowpass filter frequency (default: "EngineLowPass")
mixerDistortionParam	Distortion level (default: "EngineDistortion")
mixerReverbParam	Reverb mix (default: "EngineReverb")

Notes

• Samples are automatically sorted by RPM on initialization
• Lowpass filter opens at high RPM and under load for realistic sound character
• Reverb increases when coasting (off-throttle) for exhaust resonance effect
• High distortion values reduce effective volume; compensate with loadVolumeBoostDB