diff --git a/analyze_tonedetect_F32.cpp b/analyze_tonedetect_F32.cpp
index 86affea..760a7b8 100644
--- a/analyze_tonedetect_F32.cpp
+++ b/analyze_tonedetect_F32.cpp
@@ -99,7 +99,7 @@ float AudioAnalyzeToneDetect_F32::read(void)  {
     len = length;
     __enable_irq();
     power = q1*q1 + q2*q2 - q1*q2*coef;
-    return 2.0f*sqrtf(power)/(float)len; // Scale to (0.0, 1.0)
+    return 2.0f*gain*sqrtf(power)/(float)len; // Scaled to gain*(0.0, 1.0)
     }
 
 AudioAnalyzeToneDetect_F32::operator bool()  {
@@ -112,7 +112,7 @@ AudioAnalyzeToneDetect_F32::operator bool()  {
     q2 = out2;
     len = length;
     __enable_irq();
-    power = q1*q1 + q2*q2 - q1*q2*coef;
+    power = gain*gain*(q1*q1 + q2*q2 - q1*q2*coef);
     trigger = (float)len * thresh;
     trigger *= trigger;
     //Serial.println("bool: power, trigger = "); Serial.print(power, 6); Serial.print(", "); Serial.println(trigger, 6);
diff --git a/analyze_tonedetect_F32.h b/analyze_tonedetect_F32.h
index 1ec40ac..ff56c72 100644
--- a/analyze_tonedetect_F32.h
+++ b/analyze_tonedetect_F32.h
@@ -32,6 +32,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+ // Added setGain(gain) March 2023  Bob L
 
 #ifndef analyze_tonedetect_F32_h_
 #define analyze_tonedetect_F32_h_
@@ -63,6 +64,10 @@ public:
            //(uint16_t)( ( (float)sample_rate_Hz/freq*(float)cycles) + 0.5f) );
         }
 
+    void setGain(float _gain) {
+        gain = _gain;
+        }
+
     bool available(void) {
         __disable_irq();
         bool flag = new_output;
@@ -91,6 +96,7 @@ private:
     float s1, s2;            // Goertzel algorithm state
     float out1, out2;        // Goertzel algorithm state output
     float power;
+    float gain = 1.0f;       // Voltage gain, added Mar 2023
     uint16_t length;         // number of samples to analyze
     uint16_t count;          // how many left to analyze
     uint16_t ncycles;        // number of waveform cycles to seek