void setVelocity(int sourceId, FloatBuffer vel) {
		AL10.alSource(sourceId, AL10.AL_VELOCITY, vel);		
		
		int error = AL10.alGetError();
		if (error != AL10.AL_NO_ERROR) {
			this.logger.logError(LOGGING_SOURCE, "unable to set velocity of open al source, error: " + error);
		}				
	}