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flip mbpulse phase

--- a/leaf/Src/leaf-math.c

+++ b/leaf/Src/leaf-math.c

@@ -839,12 +839,6 @@

     i = lrintf(r - 0.5f);

     r -= (float)i;

     i &= MINBLEP_PHASE_MASK;  /* extreme modulation can cause i to be out-of-range */

-    /* this would be better than the above, but more expensive:

-     *  while (i < 0) {

-     *    i += MINBLEP_PHASES;

-     *    index++;

-     *  }

-     */

     while (i < MINBLEP_PHASES * STEP_DD_PULSE_LENGTH) {

         buffer[index] += scale * (step_dd_table[i].value + r * step_dd_table[i].delta);

--- a/leaf/Src/leaf-oscillators.c

+++ b/leaf/Src/leaf-oscillators.c

@@ -1181,7 +1181,7 @@

     c->_j = j;

     c->_k = k;

-    return c->out;

+    return -c->out;

 }

 void tMBPulse_setFreq(tMBPulse* const osc, float f)

@@ -1483,7 +1483,7 @@

     c->_j = j;

     c->_k = k;

-    return c->out;

+    return -c->out;

 }

 void tMBTriangle_setFreq(tMBTriangle* const osc, float f)

@@ -1655,7 +1655,7 @@

     c->_z = z;

     c->_j = j;

-    return c->out;

+    return -c->out;

 }

 void tMBSaw_setFreq(tMBSaw* const osc, float f)