First init.

libraries/Adafruit_seesaw_Library/examples/audio_spectrum/Audio_Spectrum/Audio_Spectrum.ino

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+/*
+  Audio Spectrum.
+
+  This example shows how to set the audio sampling rate and read
+  audio spectrum data from a compatible Seesaw device.
+*/
+
+#include <seesaw_spectrum.h>
+
+seesaw_Audio_Spectrum ss;
+
+// The setup routine runs once when you press reset:
+void setup() {
+  Serial.begin(115200);
+  
+  while (!Serial) delay(10);   // wait until serial port is opened
+  Serial.println("A");
+  
+  if (!ss.begin()) {
+    Serial.println("seesaw not found!");
+    while(1) delay(10);
+  }
+  Serial.println("B");
+
+  // Configure audio sampling rate, which determines the peak
+  // frequency of the spectrum output. There are 32 possible values
+  // (0-31), where lower numbers = higher frequency.
+  // The corresponding frequency for each setting will depend on the
+  // F_CPU frequency on the Seesaw device, which has not yet been
+  // determined. 10 or 20 MHz would be ideal, but others may happen,
+  // so specific numbers are not documented here yet.
+  // If 10 or 20 MHz, value of 12 here maps to 6250 Hz:
+  ss.setRate(12);
+}
+
+// The loop routine runs over and over again forever:
+void loop() {
+  ss.getData(); // Pull audio spectrum data from device
+  // Print contents of each of the 64 spectrum bins...
+  for (uint8_t i=0; i<64; i++) {
+    Serial.print(ss.getLevel(i));
+    Serial.write(' ');
+  }
+  Serial.println();
+}