diff --git a/lib/fast_decode.f90 b/lib/fast_decode.f90
index c4d120beb..6ae8c6388 100644
--- a/lib/fast_decode.f90
+++ b/lib/fast_decode.f90
@@ -91,7 +91,7 @@ subroutine fast_decode(id2,narg,ntrperiod,bShMsgs,line,mycall_12,   &
      ndat=ndat0
      call wav11(id2,ndat,dat)
      nzz=11025*ntrperiod
-     if(ndat.lt.nzz) dat(npts+1:nzz)=0.0
+     if(ndat.lt.nzz) dat(ndat+1:nzz)=0.0
      ndat=min(ndat,30*11025)
      call ana932(dat,ndat,cdat,npts)          !Make downsampled analytic signal
   endif
diff --git a/lib/iscat.f90 b/lib/iscat.f90
index 652aaf3aa..bfba9fe09 100644
--- a/lib/iscat.f90
+++ b/lib/iscat.f90
@@ -146,7 +146,8 @@ subroutine iscat(cdat0,npts0,nh,npct,t2,pick,cfile6,minsync,ntol,   &
         endif
 
         isync = xsync
-        if(navg.gt.0 .and. isync.ge.max(minsync,0) .and. maxlines.ge.2) then
+        if(avg.gt.2.5 .and. xsync.ge.max(float(minsync),1.5) .and. &
+             maxlines.ge.2) then
            nsig=nint(sig)
            nworst=10.0*(worst-1.0)
            navg=10.0*(avg-1.0)
diff --git a/lib/synciscat.f90 b/lib/synciscat.f90
index 69a48b14f..5ce27acfe 100644
--- a/lib/synciscat.f90
+++ b/lib/synciscat.f90
@@ -39,6 +39,7 @@ subroutine synciscat(cdat,npts,nh,npct,s0,jsym,df,ntol,NFreeze,    &
   df=fsample/nfft
   fac=1.0/1000.0                       !Somewhat arbitrary
   savg=0.
+  s0=0.
 
   ia=1-kstep
   do j=1,4*nsym                                   !Compute symbol spectra
@@ -109,17 +110,9 @@ subroutine synciscat(cdat,npts,nh,npct,s0,jsym,df,ntol,NFreeze,    &
      ref=nfold*4
 
      i0=27
-     ia=i0-400/df                          !Set search range in frequency...
-     ib=i0+400/df
-     if(mode4.eq.1) then
-        i0=95
-        ia=i0-600/df                          !Set search range in frequency...
-        ib=i0+600/df
-     endif
-     if(nfreeze.eq.1) then
-        ia=i0+(mousedf-ntol)/df
-        ib=i0+(mousedf+ntol)/df
-     endif
+     if(mode4.eq.1) i0=95
+     ia=i0-nint(ntol/df)
+     ib=i0+nint(ntol/df)
      if(ia.lt.1) ia=1
      if(ib.gt.nfft-3) ib=nfft-3
 
@@ -164,9 +157,9 @@ subroutine synciscat(cdat,npts,nh,npct,s0,jsym,df,ntol,NFreeze,    &
            ipk2=i
         endif
      enddo
-     
+
      msglen=(ipk2-ipk)/2
-     if(msglen.lt.2 .or. msglen.gt.29) msglen=3
+     if(msglen.lt.2 .or. msglen.gt.29) cycle
 
      if(xsync.ge.xsyncbest) then
         xsyncbest=xsync