From 3bda521d6201eca2706070491b2906b04b6936cf Mon Sep 17 00:00:00 2001
From: Jens Ahrensfeld <jens@jayfield.org>
Date: Sat, 2 Aug 2025 12:04:40 +0200
Subject: [PATCH] - fixed master volume - added osc jitter to blep waveform
 saw, square and tri

---
 Source/PluginProcessor.cpp | 14 +++++++++++++
 Source/synth/blit.c        | 40 ++++++++++++++++++++++++++++++--------
 Source/synth/blit.h        |  9 ++++++---
 3 files changed, 52 insertions(+), 11 deletions(-)

diff --git a/Source/PluginProcessor.cpp b/Source/PluginProcessor.cpp
index a971e81..03c36f6 100644
--- a/Source/PluginProcessor.cpp
+++ b/Source/PluginProcessor.cpp
@@ -610,10 +610,24 @@ void JaySynthAudioProcessor::processBlock (AudioSampleBuffer& buffer, MidiBuffer
 	}
 
 	for (i=0; i <numSamples; i++)
+	{
 		buf1[i] = (float)(buf[0][i]*limiter_gain[i]);
+	}
 
 	for (i=0; i <numSamples; i++)
+	{
 		buf2[i] = (float)(buf[1][i]*limiter_gain[i]);
+	}
+#else
+	for (i=0; i <numSamples; i++)
+	{
+		buf1[i] = (float)(buf[0][i]);
+	}
+
+	for (i=0; i <numSamples; i++)
+	{
+		buf2[i] = (float)(buf[1][i]);
+	}
 #endif
 
     // In case we have more outputs than inputs, we'll clear any output
diff --git a/Source/synth/blit.c b/Source/synth/blit.c
index 43fcf83..dee60d7 100644
--- a/Source/synth/blit.c
+++ b/Source/synth/blit.c
@@ -91,7 +91,31 @@ synth_float_t IP_Process(blit_t *pObj, synth_float_t *pLUT, synth_float_t m)
 	}
 	return y;
 }
-	
+
+void BLIT_process_misc(blit_t *pObj)
+{
+	if (pObj->misc_process_downsammple_counter)
+	{
+		pObj->misc_process_downsammple_counter--;
+		return;
+	}
+
+	pObj->misc_process_downsammple_counter = BLIT_MISC_PROCESS_DOWN_SAMPLE;
+
+	const synth_float_t alpha = BLIT_JITTER_ERROR*BLIT_MISC_PROCESS_DOWN_SAMPLE;
+	synth_float_t pm = Noise_Uniform(&pObj->pCom->noise, 1, 0);
+
+	if (pm > 0)
+	{
+		pObj->jitter += alpha;
+	}
+	else 
+	{
+		pObj->jitter -= alpha;
+	}
+
+}
+
 void BLIT_freq_update(blit_t *pObj, synth_float_t scale)
 {
 	synth_float_t p;
@@ -99,7 +123,7 @@ void BLIT_freq_update(blit_t *pObj, synth_float_t scale)
 	pObj->freq_update_req = 0;
 
 //	p = pObj->fs/(pObj->f*scale*pObj->fm);
-	p = pObj->fs/(scale*pObj->fm);
+	p = pObj->fs/(scale * pObj->fm * (1 + pObj->jitter));
 
 	pObj->dx  = (synth_float_t)1.0/p;
 	pObj->m = umin(BLIT_NUM_HARM_MAX-1, (UINT32)((synth_float_t)SYNTH_BANDWIDTH*2.0*(int)((p/2)) + 0));
@@ -259,7 +283,8 @@ void BLIT_Reset(blit_t *pObj, synth_float_t phase)
 	pObj->fm = 1;
 	pObj->pwm = 0;
 	pObj->pulse_offset = 0;		// ToDo: Adjust according to phase
-	pObj->pm_filtered = 0;
+	pObj->jitter = 0;
+	pObj->misc_process_downsammple_counter = BLIT_MISC_PROCESS_DOWN_SAMPLE;
 }
 
 void BLIT_Start(blit_t *pObj)
@@ -284,13 +309,10 @@ void BLIT_Process_SAW_Vector(blit_t *pObj, synth_float_t *pPitch, synth_float_t
 	if (pSyncOut)
 		memset(pSyncOut, 0, len*sizeof(synth_float_t));
 
-	synth_float_t alpha = 0.001;
-	synth_float_t pm = Noise_Gaussian(&pObj->pCom->noise, 0.01, 0);
-	pObj->pm_filtered = pObj->pm_filtered*(1.0 - alpha) + pm*alpha;
-
 	// Create output
 	for (i=0; i< len; i++)
 	{
+		BLIT_process_misc(pObj);
 		if (pObj->freq_update_req)
 		{
 			BLIT_freq_update(pObj, pPitch[i]);
@@ -303,7 +325,7 @@ void BLIT_Process_SAW_Vector(blit_t *pObj, synth_float_t *pPitch, synth_float_t
 			{
 				pObj->fm = (synth_float_t)pow((synth_float_t)2, pCV_fm[i]);
 			}
-			BLIT_freq_update(pObj, pPitch[i] * (1+pObj->pm_filtered));
+			BLIT_freq_update(pObj, pPitch[i]);
 		}
 
 		m = pObj->m;
@@ -334,6 +356,7 @@ void BLIT_Process_SQR_Vector(blit_t *pObj, synth_float_t *pPitch, synth_float_t
 	// Create output
 	for (i=0; i< len; i++)
 	{
+		BLIT_process_misc(pObj);
 		if (pObj->freq_update_req)
 		{
 			BLIT_freq_update(pObj, pPitch[i]);
@@ -403,6 +426,7 @@ void BLIT_Process_TRI_Vector(blit_t *pObj, synth_float_t *pPitch, synth_float_t
 
 	for (i=0; i< len; i++)
 	{
+		BLIT_process_misc(pObj);
 		if (pObj->freq_update_req)
 		{
 			BLIT_freq_update(pObj, pPitch[i]);
diff --git a/Source/synth/blit.h b/Source/synth/blit.h
index 807eb59..1263b88 100644
--- a/Source/synth/blit.h
+++ b/Source/synth/blit.h
@@ -6,7 +6,10 @@
 #include "synth_defs.h"
 #include "noise.h"
 #include "synth_types.h"
- 
+
+#define BLIT_MISC_PROCESS_DOWN_SAMPLE	2
+#define BLIT_JITTER_ERROR				0.0000001
+
 // --------------------------------------------------------------
 // Types
 // --------------------------------------------------------------
@@ -30,8 +33,8 @@ typedef struct _sblit_t
 	synth_float_t tri_x, tri_sum;
 	UINT32 m, tri_pol, sqr_pol1, sqr_pol2; 
 	UINT32 freq_update_req, bufsize;
-	synth_float_t pm_filtered;
-
+	synth_float_t jitter;
+	UINT32 misc_process_downsammple_counter;
 } blit_t;
 
 // --------------------------------------------------------------