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diff --git a/script/test_2020x.sh b/script/test_2020x.sh
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+#!/bin/bash -x
+# test_2020x.sh
+# David Rowe Feb 2022
+#
+# Script to support testing experimental 2020A and 2020B modes and 700E control.
+
+CODEC2_PATH=$HOME/codec2
+PATH=$PATH:$CODEC2_PATH/build_linux/src:$CODEC2_PATH/build_linux/misc
+FADING_DIR=$CODEC2_PATH/build_linux/unittest
+No_AWGN=-20
+No_AWGN_LOW=-17
+No_Multipath=-25
+serial=0
+compressor_gain=6
+
+# Approximation of Hilbert clipper analog compressor
+function analog_compressor {
+    input_file=$1
+    output_file=$2
+    gain=$3
+    cat $input_file | ch - - 2>/dev/null | \
+    ch - - --No -100 --clip 16384 --gain $gain 2>/dev/null | \
+    # final line prints peak and CPAPR for SSB
+    ch - - --clip 16384 |
+    # manually adjusted to get similar peak levels for SSB and FreeDV
+    sox -t .s16 -r 8000 -c 1 -v 0.85 - -t .s16 $output_file
+}
+
+function run_sim_ssb() {
+    fullfile=$1
+    filename=$(basename -- "$fullfile")
+    extension="${filename##*.}"
+    filename="${filename%.*}"
+    channel=$2
+    No=-100
+    if [ "$channel" == "awgn" ]; then
+        channel_opt=""
+        No=$No_AWGN
+    fi
+    if [ "$channel" == "awgnlow" ]; then
+        channel_opt=""
+        No=$No_AWGN_LOW
+    fi
+    if [ "$channel" == "mpp" ] || [ "$channel" == "mpd" ]; then
+        channel_opt='--'${channel}
+        No=$No_Multipath
+    fi
+    fn=${filename}_ssb_${channel}.wav
+    analog_compressor ${fullfile} ${filename}_ssb.raw ${compressor_gain}
+    tmp=$(mktemp)
+    ch ${filename}_ssb.raw $tmp --No $No ${channel_opt} --fading_dir ${FADING_DIR} 2>t.txt
+    cat $tmp | sox -t .s16 -r 8000 -c 1 - ${fn} trim 0 6
+    snr=$(cat t.txt | grep "SNR3k(dB):" | tr -s ' ' | cut -d' ' -f3)
+    
+    echo "<tr>"
+    echo "<td><a href=\"${fn}\">${serial}</a></td><td>ssb</td><td></td><td></td><td>${channel}</td><td>${snr}</td>"
+    echo "</tr>"
+    serial=$((serial+1))
+}
+
+function run_sim() {
+    fullfile=$1
+    filename=$(basename -- "$fullfile")
+    extension="${filename##*.}"
+    filename="${filename%.*}"
+    mode=$2
+    if [ "$mode" == "700E" ] || [ "$mode" == "700D" ]; then
+        rateHz=8000
+    else
+        rateHz=16000
+    fi
+    clip=$3
+    if [ "$clip" == "clip" ]; then
+        clipflag=1
+        clip_html="yes"
+    else
+        clipflag=0
+        clip_html="no"
+    fi       
+    channel=$4
+    No=-100
+    if [ "$channel" == "awgn" ]; then
+        channel_opt=""
+        No=$No_AWGN
+    fi
+    if [ "$channel" == "awgnlow" ]; then
+        channel_opt=""
+        No=$No_AWGN_LOW
+    fi
+    if [ "$channel" == "mpp" ] || [ "$channel" == "mpd" ]; then
+        channel_opt='--'${channel}
+        No=$No_Multipath
+    fi
+
+    indopt=$5
+    indopt_flag=""
+    indopt_html="no"
+    indopt_str=""
+    if [ "$indopt" == "indopt" ]; then
+        indopt_flag="--indopt 1"
+        indopt_str="_indopt"
+        indopt_html="yes"
+    fi
+    if [ "$indopt" == "no_indopt" ]; then
+        indopt_flag="--indopt 0"
+        indopt_str="_no_indopt"
+    fi
+    
+    fn=${filename}_${mode}_${clip}_${channel}${indopt_str}.wav
+    tmp=$(mktemp)
+    # note we let ch finish to get SNR stats (trim at end of sox causes an early termination)
+    freedv_tx ${mode} ${fullfile} - --clip ${clipflag} ${indopt_flag} | \
+    ch - $tmp --No $No ${channel_opt} --fading_dir ${FADING_DIR} 2>t.txt
+    freedv_rx ${mode} ${indopt_flag} $tmp - | \
+    sox -t .s16 -r ${rateHz} -c 1 - ${fn} trim 0 6
+    snr=$(cat t.txt | grep "SNR3k(dB):" | tr -s ' ' | cut -d' ' -f3)
+
+    echo "<tr>"
+    echo "<td><a href=\"${fn}\">${serial}</a></td><td>${mode}</td><td>${clip_html}</td><td>${indopt_html}</td><td>${channel}</td><td>${snr}</td>"
+    echo "</tr>"
+    serial=$((serial+1))
+}
+
+# convert speech input file to format we need
+SPEECH_IN_16k_WAV=~/Downloads/speech_orig_16k.wav 
+SPEECH_IN_16k_RAW=speech_orig_16k.raw
+SPEECH_IN_8k_RAW=speech_orig_8k.raw
+sox $SPEECH_IN_16k_WAV -t .s16 $SPEECH_IN_16k_RAW
+sox $SPEECH_IN_16k_WAV -t .s16 -r 8000 $SPEECH_IN_8k_RAW
+
+echo "<html><table>"
+echo "<tr><th>Serial</th><th>Mode</th><th>Clip</th><th>index_opt</th><th>Channel</th><th>SNR (dB)</th></tr>"
+
+# run simulations
+
+run_sim_ssb $SPEECH_IN_8k_RAW awgn
+run_sim_ssb $SPEECH_IN_8k_RAW mpp
+run_sim_ssb $SPEECH_IN_8k_RAW mpd
+
+run_sim $SPEECH_IN_16k_RAW 2020 noclip clean
+run_sim $SPEECH_IN_8k_RAW 700E clip clean
+
+run_sim $SPEECH_IN_16k_RAW 2020 noclip awgn
+run_sim $SPEECH_IN_16k_RAW 2020 noclip mpp
+run_sim $SPEECH_IN_16k_RAW 2020 noclip mpd
+run_sim $SPEECH_IN_16k_RAW 2020 clip awgn
+run_sim $SPEECH_IN_16k_RAW 2020 clip mpp
+run_sim $SPEECH_IN_16k_RAW 2020 clip mpd
+
+run_sim $SPEECH_IN_16k_RAW 2020B clip awgn indopt
+run_sim $SPEECH_IN_16k_RAW 2020B clip mpp  indopt
+run_sim $SPEECH_IN_16k_RAW 2020B clip mpp  no_indopt
+run_sim $SPEECH_IN_16k_RAW 2020B clip mpd  indopt
+run_sim $SPEECH_IN_16k_RAW 2020B clip mpd  no_indopt
+
+run_sim $SPEECH_IN_8k_RAW 700E clip awgn
+run_sim $SPEECH_IN_8k_RAW 700E clip mpp
+run_sim $SPEECH_IN_8k_RAW 700E clip mpd
+
+# Low SNR samples
+run_sim_ssb $SPEECH_IN_8k_RAW awgnlow
+run_sim $SPEECH_IN_8k_RAW 700E clip awgnlow
+run_sim $SPEECH_IN_16k_RAW 2020 clip awgnlow
+run_sim $SPEECH_IN_16k_RAW 2020A clip awgnlow indopt
+
+exit