diff --git a/Modulator.cpp b/Modulator.cpp
index 9155e5886..5775926ea 100644
--- a/Modulator.cpp
+++ b/Modulator.cpp
@@ -5,6 +5,7 @@
 #include <QDebug>
 #include "mainwindow.h"
 #include "soundout.h"
+#include "commons.h"
 
 #include "moc_Modulator.cpp"
 
@@ -86,7 +87,8 @@ void Modulator::start (unsigned symbolsLength, double framesPerSymbol,
   if(m_bFastMode) m_ic=0;
 
   m_silentFrames = 0;
-  // calculate number of silent frames to send
+  // calculate number of silent frames to send, so that audio will start at
+  // the nominal time "delay_ms" into the Tx sequence.
   if (synchronize && !m_tuning && !m_bFastMode)	{
     m_silentFrames = m_ic + m_frameRate / (1000 / delay_ms) - (mstr * (m_frameRate / 1000));
   }
@@ -168,6 +170,7 @@ qint64 Modulator::readData (char * data, qint64 maxSize)
     case Active:
       {
         unsigned int isym=0;
+//        qDebug() << "Mod A" << m_toneSpacing << m_ic;
         if(!m_tuning) isym=m_ic/(4.0*m_nsps);            // Actual fsample=48000
         bool slowCwId=((isym >= m_symbolsLength) && (icw[0] > 0)) && (!m_bFastMode);
         if(m_TRperiod==3) slowCwId=false;
@@ -248,7 +251,7 @@ qint64 Modulator::readData (char * data, qint64 maxSize)
           i0=i1-816;
         }
 
-
+        qint16 sample;
         for (unsigned i = 0; i < numFrames && m_ic <= i1; ++i) {
           isym=0;
           if(!m_tuning and m_TRperiod!=3) isym=m_ic / (4.0 * m_nsps);         //Actual
@@ -264,7 +267,7 @@ qint64 Modulator::readData (char * data, qint64 maxSize)
                 m_toneFrequency0=m_frequency + itone[isym]*m_toneSpacing;
               }
             }
-//            qDebug() << "B" << m_bFastMode << m_ic << numFrames << isym << itone[isym]
+//            qDebug() << "Mod B" << m_bFastMode << m_ic << numFrames << isym << itone[isym]
 //                     << m_toneFrequency0 << m_nsps;
             m_dphi = m_twoPi * m_toneFrequency0 / m_frameRate;
             m_isym0 = isym;
@@ -285,7 +288,12 @@ qint64 Modulator::readData (char * data, qint64 maxSize)
           if (m_ic > i0) m_amp = 0.98 * m_amp;
           if (m_ic > i1) m_amp = 0.0;
 
-          samples = load (postProcessSample (m_amp * qSin (m_phi)), samples);
+          sample=qRound(m_amp*qSin(m_phi));
+          if(m_toneSpacing < 0) sample=qRound(m_amp*foxcom_.wave[m_ic]);
+
+//          if(m_ic < 100) qDebug() << "Mod C" << m_ic << m_amp << foxcom_.wave[m_ic] << sample;
+
+          samples = load(postProcessSample(sample), samples);
           ++framesGenerated;
           ++m_ic;
         }
diff --git a/commons.h b/commons.h
index c07ee2596..d0eef792a 100644
--- a/commons.h
+++ b/commons.h
@@ -79,6 +79,10 @@ extern struct {
   float red[4096];
 } echocom_;
 
+extern struct {
+  float wave[606720];
+} foxcom_;
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/ft8/foxgen.f90 b/lib/ft8/foxgen.f90
index f1971a6b5..22a4cfdb0 100644
--- a/lib/ft8/foxgen.f90
+++ b/lib/ft8/foxgen.f90
@@ -14,6 +14,7 @@ subroutine foxgen(t)
   real x(NFFT),y(NFFT)
   real*8 dt,twopi,f0,fstep,dfreq,phi,dphi
   complex cx(0:NH),cy(0:NH)
+  common/foxcom/wave
   equivalence (x,cx),(y,cy)
 
   call system_clock(count0,clkfreq)
@@ -67,10 +68,14 @@ subroutine foxgen(t)
      
      call system_clock(count1,clkfreq)
      time=float(count1-count0)/float(clkfreq)    !Cumulative execution time
-!     write(*,3001) n,k,time,msgsent
-!3001 format(i1,i8,f10.6,2x,a22)
+     write(*,3001) n,k,i,time,msgsent
+3001 format(i1,i8,i4,f10.6,2x,a22)
+     if(i.ge.m) exit
   enddo
 
+  fac=1.0/maxval(abs(wave))
+  wave=fac*wave
+
   x(1:k)=wave
   x(k+1:)=0.
   call four2a(x,nfft,1,-1,0)
@@ -88,11 +93,11 @@ subroutine foxgen(t)
 !        sy=sy + real(cy(k))**2 + aimag(cy(k))**2
      enddo
      freq=df*(k-nadd/2+0.5)
-!     write(29,1022) freq,sx,sy,db(sx)-90.0,db(sy)-90.0
-!1022 format(f10.3,2e12.3,2f10.3)
+     write(29,1022) freq,sx,sy,db(sx)-90.0,db(sy)-90.0
+1022 format(f10.3,2e12.3,2f10.3)
      if(freq.gt.3000.0) exit
   enddo
-!  flush(29)
+  flush(29)
 
   call system_clock(count1,clkfreq)
   time=float(count1-count0)/float(clkfreq)    !Cumulative execution time
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 35c3ad4ad..0b4187366 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -3326,11 +3326,10 @@ void MainWindow::guiUpdate()
             if(m_config.bFox()) {
               QString t=ui->textBrowser3->toPlainText();
               int len=t.length();
-              qint64 ms0=QDateTime::currentMSecsSinceEpoch();
+//              qint64 ms0=QDateTime::currentMSecsSinceEpoch();
               foxgen_(const_cast <char *> (t.toLatin1().constData()),len);
-              qint64 ms=QDateTime::currentMSecsSinceEpoch();
-              qDebug() << "aa" << m_Nslots << ms-ms0 << t;
-
+//              qint64 ms=QDateTime::currentMSecsSinceEpoch();
+//              qDebug() << "aa" << m_Nslots << ms-ms0 << t;
             } else {
               genft8_(message, MyGrid, &bcontest, &m_i3bit, msgsent, const_cast<char *> (ft8msgbits),
                       const_cast<int *> (itone), 22, 6, 22);
@@ -6001,6 +6000,7 @@ void MainWindow::transmit (double snr)
   if (m_modeTx == "FT8") {
     toneSpacing=12000.0/1920.0;
     if(m_config.x2ToneSpacing()) toneSpacing=2*12000.0/1920.0;
+    if(m_config.bFox()) toneSpacing=-1;
     Q_EMIT sendMessage (NUM_FT8_SYMBOLS,
            1920.0, ui->TxFreqSpinBox->value () - m_XIT,
            toneSpacing, m_soundOutput, m_config.audio_output_channel (),