Revert "GranularPitchShifterEffect should not call checkGate"

This reverts commit 67526f0.

plugins/GranularPitchShifter/GranularPitchShifterEffect.cpp

@@ -91,6 +91,7 @@ double GranularPitchShifterEffect::processImpl(SampleFrame* buf, const fpp_t fra
 	const float shapeK = cosWindowApproxK(shape);
 	const int sizeSamples = m_sampleRate / size;
 	const float waitMult = sizeSamples / (density * 2);
+	double outSum = 0.0;
 
 	for (fpp_t f = 0; f < frames; ++f)
 	{
@@ -235,6 +236,7 @@ double GranularPitchShifterEffect::processImpl(SampleFrame* buf, const fpp_t fra
 
 		buf[f][0] = d * buf[f][0] + w * s[0];
 		buf[f][1] = d * buf[f][1] + w * s[1];
+		outSum += buf[f].sumOfSquaredAmplitudes();
 	}
 
 	if (m_sampleRateNeedsUpdate)
@@ -243,7 +245,7 @@ double GranularPitchShifterEffect::processImpl(SampleFrame* buf, const fpp_t fra
 		changeSampleRate();
 	}
 
-	return -1.0;
+	return outSum;
 }
 
 void GranularPitchShifterEffect::changeSampleRate()