diff --git a/lib/jt9sim.f90 b/lib/jt9sim.f90
index 16f40a0f9..8147c4b69 100644
--- a/lib/jt9sim.f90
+++ b/lib/jt9sim.f90
@@ -5,7 +5,7 @@ program jt9sim
   parameter (NMAX=1800*12000)
   integer ihdr(11)
   integer*2 iwave                  !Generated waveform (no noise)
-  real*8 f0,f,dt,twopi,phi,dphi,baud,fspan
+  real*8 f0,f,dt,twopi,phi,dphi,baud,fspan,fsample,freq
   character msg*22,msg0*22,message*22,msgsent*22,arg*8,fname*11
 
   integer*4 i4tone(85)             !Channel symbols (values 0-8)
@@ -106,7 +106,7 @@ program jt9sim
 1020    format(i3,i4,f10.3,f7.1,2x,a22)
 
         phi=0.
-        baud=12000.0/nsps
+        baud=12000.d0/nsps
         k=12000                             !Start audio at t = 1.0 s
         do isym=1,85
            freq=f + i4tone(isym)*baud
diff --git a/lib/jt9test.f90 b/lib/jt9test.f90
index 4b65a12a0..aa0b37158 100644
--- a/lib/jt9test.f90
+++ b/lib/jt9test.f90
@@ -1,120 +1,181 @@
 program jt9test
 
-! Decoder for JT9.
+! Decoder for JT9.  Can run stand-alone, reading data from *.wav files;
+! or as the back end of wsjt-x, with data placed in a shared memory region.
 
+! NB: For unknown reason, ***MUST*** be compiled by g95 with -O0 !!!
+
+  character*80 arg,infile
   parameter (NMAX=1800*12000)        !Total sample intervals per 30 minutes
   parameter (NDMAX=1800*1500)        !Sample intervals at 1500 Hz rate
   parameter (NSMAX=22000)            !Max length of saved spectra
+  integer*4 ihdr(11)
+  real*4 s(NSMAX)
+  real*4 ccfred(NSMAX)
+  logical*1 lstrong(0:1023)
+  integer*1 i1SoftSymbols(207)
   character*22 msg
   character*33 line
-  character*80 fmt,fmt14
-  real*4 ccfred(NSMAX)
-  integer*1 i1SoftSymbols(207)
-  integer ii(1)
-  complex c0(NDMAX)
-!  common/jt9com/ss0(184,NSMAX),savg(NSMAX),id2(NMAX),nutc0,ndiskdat,    &
-!       ntr,nfqso,newdat,npts80,nfb,ntol,kin,nzhsym,nsynced,ndecoded
-!  common/jt9comB/ss(184,NSMAX),c0
+  integer*2 id2
+  complex c0
+  complex c1(0:2700000)
+  common/jt9com/ss(184,NSMAX),savg(NSMAX),c0(NDMAX),id2(NMAX),nutc,ndiskdat,  &
+       ntr,mousefqso,newdat,nfa,nfb,ntol,kin,nzhsym,nsynced,ndecoded
   common/tracer/limtrace,lu
 
+  nargs=iargc()
+  if(nargs.lt.1) then
+     print*,'Usage: jt9 TRperiod file1 [file2 ...]'
+     print*,'       Reads data from *.wav files.'
+     print*,''
+     print*,'       jt9 -s'
+     print*,'       Gets data from shared memory region.'
+     go to 999
+  endif
+  call getarg(1,arg)
+  if(arg(1:2).eq.'-s') then
+!     call jt9a
+!    call ftnquit
+     go to 999
+  endif
+  read(arg,*) ntrperiod
+
+  ifile1=2
+
   limtrace=0
   lu=12
-  open(12,file='timer.out',status='unknown')
-  open(13,file='decoded.txt',status='unknown')
-  open(14,file='wsjtx_rx.log',status='unknown',position='append')
-  call timer('decoder ',0)
+  nfa=1000
+  nfb=2000
+  ntol=500
+  nfqso=1500
+  newdat=1
+  nb=0
+  nbslider=100
+  limit=20000
+  ndiskdat=1
 
-1 read(61,end=999) ipk,ia,ib,ccfred(ia:ib),nsps,npts8,c0(1:npts8)
-  print*,ipk,ia,ib,nsps,npts8
-  ntrMinutes=1
+  do ifile=ifile1,nargs
+     call getarg(ifile,infile)
+     open(10,file=infile,access='stream',status='old',err=998)
+     read(10) ihdr
+     i1=index(infile,'.wav')
+     read(infile(i1-4:i1-1),*,err=1) nutc0
+     go to 2
+1    nutc0=0
+2    nsps=0
+     if(ntrperiod.eq.1)  then
+        nsps=6912
+        nzhsym=181
+     else if(ntrperiod.eq.2)  then
+        nsps=15360
+        nzhsym=178
+     else if(ntrperiod.eq.5)  then
+        nsps=40960
+        nzhsym=172
+     else if(ntrperiod.eq.10) then
+        nsps=82944
+        nzhsym=171
+     else if(ntrperiod.eq.30) then
+        nsps=252000
+        nzhsym=167
+     endif
+     if(nsps.eq.0) stop 'Error: bad TRperiod'
 
-  nsynced=0
-  ndecoded=0
-  limit=200
-  if(ndepth.ge.2) limit=2000
-  if(ndepth.ge.3) limit=20000
-
-  nsps=0
-  if(ntrMinutes.eq.1) then
-     nsps=6912
-     df3=1500.0/2048.0
-     fmt='(i4.4,i4,i5,f6.1,f8.0,f6.1,3x,a22)'
-     fmt14='(i4.4,i4,i5,f6.1,f8.0,f6.1,i8,3x,a22)'
-  else if(ntrMinutes.eq.2) then
-     nsps=15360
-     df3=1500.0/2048.0
-     fmt='(i4.4,i4,i5,f6.1,f8.1,f6.2,3x,a22)'
-     fmt14='(i4.4,i4,i5,f6.1,f8.1,f6.2,i8,3x,a22)'
-  else if(ntrMinutes.eq.5) then
-     nsps=40960
-     df3=1500.0/6144.0
-     fmt='(i4.4,i4,i5,f6.1,f8.1,f6.2,3x,a22)' 
-     fmt14='(i4.4,i4,i5,f6.1,f8.1,f6.2,i8,3x,a22)'
- else if(ntrMinutes.eq.10) then
-     nsps=82944
-     df3=1500.0/12288.0
-     fmt='(i4.4,i4,i5,f6.1,f8.2,f6.2,3x,a22)'
-     fmt14='(i4.4,i4,i5,f6.1,f8.2,f6.2,i8,3x,a22)'
-  else if(ntrMinutes.eq.30) then
-     nsps=252000
-     df3=1500.0/32768.0
-     fmt='(i4.4,i4,i5,f6.1,f8.2,f6.2,3x,a22)'
-     fmt14='(i4.4,i4,i5,f6.1,f8.2,f6.2,i8,3x,a22)'
-  endif
-  if(nsps.eq.0) stop 'Error: bad TRperiod'    !Better: return an error code###
-
-  fgood=0.
-  df8=1500.0/(nsps/8)
-  sbest=0.
-
-10 ii=maxloc(ccfred(ia:ib))
-  i=ii(1) + ia - 1
-  f=(i-1)*df3
-  if((i.eq.ipk .or. ccfred(i).ge.3.0) .and. abs(f-fgood).gt.10.0*df8) then
-     call timer('spec9   ',0)
-     call spec9(c0,npts8,nsps,f,fpk,xdt,snr,i1SoftSymbols)
-     call timer('spec9   ',1)
-
-     call timer('decode9 ',0)
-     call decode9(i1SoftSymbols,limit,nlim,msg)
-     call timer('decode9 ',1)
- 
-     sync=ccfred(i) - 2.0
-     if(sync.lt.0.0) sync=0.0
-     nsync=sync
-     if(nsync.gt.10) nsync=10
-     nsnr=nint(snr)
-     drift=0.0
-
-     if(ccfred(i).gt.sbest .and. fgood.eq.0.0) then
-        sbest=ccfred(i)
-        write(line,fmt) nutc,nsync,nsnr,xdt,1000.0+fpk,drift
-        if(nsync.gt.0) nsynced=1
+     kstep=nsps/2
+     tstep=kstep/12000.0
+     k=0
+     nhsym0=-999
+     npts=(60*ntrperiod-6)*12000
+     if(ifile.eq.ifile1) then
+        open(12,file='timer.out',status='unknown')
+        call timer('jt9     ',0)
      endif
 
-     if(msg.ne.'                      ') then
-        write(13,fmt) nutc,nsync,nsnr,xdt,1000.0+fpk,drift,msg
-        write(14,fmt14) nutc,nsync,nsnr,xdt,1000.0+fpk,drift,nlim,msg
-        fgood=f
-        nsynced=1
-        ndecoded=1
-        ccfred(max(ia,i):min(ib,i+8))=0.
+!     do i=1,npts
+!        id2(i)=100.0*sin(6.283185307*1600.0*i/12000.0)
+!     enddo
+
+     do iblk=1,npts/kstep
+        k=iblk*kstep
+        call timer('read_wav',0)
+        read(10,end=10) id2(k-kstep+1:k)
+        call timer('read_wav',1)
+
+        nhsym=(k-2048)/kstep
+        if(nhsym.ge.1 .and. nhsym.ne.nhsym0) then
+! Emit signal readyForFFT
+           ingain=0
+           call timer('symspec ',0)
+           call symspec(k,ntrperiod,nsps,ingain,nb,nbslider,pxdb,   &
+                s,ccfred,df3,ihsym,nzap,slimit,lstrong,npts8)
+           call timer('symspec ',1)
+           nhsym0=nhsym
+           if(ihsym.ge.184) go to 10
+        endif
+     enddo
+10   close(10)
+
+     nsps8=nsps/8
+     c1(0:npts8-1)=conjg(c0(1:npts8))
+     call test9(c1,npts8,nsps8)
+
+     iz=1000.0/df3
+     nutc=nutc0
+
+     call timer('sync9   ',0)
+     call sync9(ss,nzhsym,tstep,df3,ntol,nfqso,ccfred,ia,ib,ipk) !Get sync, freq
+     call timer('sync9   ',1)
+
+     fgood=0.
+     df8=1500.0/(nsps/8)
+     sbest=0.
+     do i=ia,ib
+        f=(i-1)*df3
+        if((i.eq.ipk .or. ccfred(i).ge.3.0) .and. f.gt.fgood+10.0*df8) then
+           call timer('spec9   ',0)
+           call spec9(c0,npts8,nsps,f,fpk,xdt,snrdb,i1SoftSymbols)
+           call timer('spec9   ',1)
+
+           call timer('decode9 ',0)
+           call decode9(i1SoftSymbols,limit,nlim,msg)
+           call timer('decode9 ',1)
+           snr=snrdb
+           sync=ccfred(i) - 2.0
+           if(sync.lt.0.0) sync=0.0
+           nsync=sync
+           if(nsync.gt.10) nsync=10
+           nsnr=nint(snr)
+           width=0.0
+
+           if(ccfred(i).gt.sbest .and. fgood.eq.0.0) then
+              sbest=ccfred(i)
+              write(line,1010) nutc,nsync,nsnr,xdt,1000.0+fpk,width
+              if(nsync.gt.0) nsynced=1
+           endif
+
+           if(msg.ne.'                      ') then
+              write(*,1010) nutc,nsync,nsnr,xdt,1000.0+fpk,width,msg
+1010          format(i4.4,i4,i5,f6.1,f8.2,f6.2,3x,a22)
+              fgood=f
+              nsynced=1
+              ndecoded=1
+           endif
+        endif
+     enddo
+
+     if(fgood.eq.0.0) then
+        write(*,1020) line
+1020    format(a33)
      endif
-  endif
-  ccfred(i)=0.
-  if(maxval(ccfred(ia:ib)).gt.3.0) go to 10
 
-  if(fgood.eq.0.0) then
-     write(13,1020) line
-     write(14,1020) line
-1020 format(a33)
-  endif
+  enddo
 
-  call flush(13)
-  call flush(14)
-  go to 1
+  call timer('jt9     ',1)
+  call timer('jt9     ',101)
+!  call ftnquit
+  go to 999
 
-999 call timer('decoder ',1)
-  call timer('decoder ',101)
+998 print*,'Cannot open file:'
+  print*,infile
 
-end program jt9test
+999 end program jt9test
diff --git a/lib/spec9.f90 b/lib/spec9.f90
index 62e6338ba..858716135 100644
--- a/lib/spec9.f90
+++ b/lib/spec9.f90
@@ -99,7 +99,6 @@ subroutine spec9(c0,npts8,nsps,fpk0,fpk,xdt,snrdb,i1SoftSymbols)
   snrdb=db(t) - db(2500.0/df8) - 5.0
      
   m0=3
-  ntones=8
   k=0
   do j=1,69
         smax=0.
diff --git a/lib/test9.f90 b/lib/test9.f90
new file mode 100644
index 000000000..d248428f7
--- /dev/null
+++ b/lib/test9.f90
@@ -0,0 +1,53 @@
+subroutine test9(c0,npts8,nsps8)
+
+  parameter (NMAX=128*864)
+  complex c0(0:npts8-1)
+  complex c1(0:NMAX-1)
+  complex c2(0:4096-1)
+  complex z
+  real p(0:3300)
+  include 'jt9sync.f90'
+
+  c1(0:npts8-1)=c0                         !Copy c0 into c1
+  c1(npts8:)=0.                            !Zero the rest of c1
+  nfft1=NMAX                               !Forward FFT length
+  call four2a(c1,nfft1,1,-1,1)             !Forward FFT
+  
+  ndown=54                                 !Downsample factor
+  nfft2=nfft1/ndown                        !Backward FFT length
+  nh2=nfft2/2
+  fac=1.e-5
+  c2(0:nh2)=fac*c1(0:nh2)
+  c2(nh2+1:nh2+nh2-1)=fac*c1(nfft1-nh2+1:nfft1-1)
+  call four2a(c2,nfft2,1,1,1)              !Backward FFT
+
+  nspsd=nsps8/ndown
+  nz=npts8/ndown
+  p=0.
+  i0=5*nspsd
+  do i=0,nz-1
+     z=sum(c2(max(i-(nspsd-1),0):i))       !Integrate
+     p(i0+i)=real(z)**2 + aimag(z)**2      !Symbol power at freq=0
+!     write(51,3001) i,p(i)
+  enddo
+
+  iz=85*nspsd
+  fac0=1.0/69.0
+  fac1=1.0/16.0
+  lagmax=13*nspsd
+  do lag=0,lagmax                          
+     ss=0.
+     do i=0,iz-1
+        if(isync(1+i/nspsd).eq.1) then
+           ss=ss + fac1*p(i+lag)           !Add the sync powers
+        else
+           ss=ss - fac0*p(i+lag)           !Subtract the non-sync powers
+        endif
+     enddo
+     write(52,3001) lag,ss
+3001 format(i5,f12.3)
+  enddo
+
+  return
+end subroutine test9
+  
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 555e5db69..04b7626f6 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -1,4 +1,4 @@
-//---------------------------------------------------------------- MainWindow
+//--------------------------------------------------------------- MainWindow
 #include "mainwindow.h"
 #include "ui_mainwindow.h"
 #include "devsetup.h"