New code results in audio noise

Question

I am working on a circuit that can record audio to an SD when a switch is HIGH and stop recording when the switch is LOW. I am using the TMRpcm library. I previously had an issue solved on these two forumsRecording Audio - Film Name Errorand Trying to save .wav files with new name every loop. These solutions solved my problem but have left me with a new one. Currently the audio recorded on the new code (which I have pasted below) results is a very noisy and muffled audio quality; while the audio recorded on the old code (also posted below) is very clear. Could this be a physical issue and if so what should I do about it? Or is it an issue I am missing in the code?

OLD CODE - provides good quality audio

//////////////////////////////////////// SD CARD
#include <SD.h>
#include <SPI.h>
#include <TMRpcm.h>
#define SD_ChipSelectPin 10
TMRpcm audio;
//////////////////////////////////////// SWITCH CASE
int audiofile = 0; // # of recording
unsigned long i = 0;
bool recmode = 0; // recording state
//////////////////////////////////////// SWITCH
int inPin = 2; // input Switch Pin
int state = HIGH; // the current state switch
int reading; // the current reading from the switch
void setup() {
 Serial.begin(9600);
 pinMode(A0, INPUT); // Microphone
 pinMode(inPin, INPUT_PULLUP); // Switch
 //////////////////////////////////////// SD CARD
 SD.begin(SD_ChipSelectPin);
 audio.CSPin = SD_ChipSelectPin;
}
void loop() {
 reading = digitalRead(inPin);
 ////////////////////////////////////////
 while (i < 300000) {
 i++;
 }
 i = 0;
 ////////////////////////////////////////
 if (reading == LOW) {
 if (recmode == 0) {
 recmode = 1;
 Serial.println("Recording");
 audiofile++; // To move case
 switch (audiofile) {
 case 1: audio.startRecording("1.wav", 16000, A0); break;
 case 2: audio.startRecording("2.wav", 16000, A0); break;
 case 3: audio.startRecording("3.wav", 16000, A0); break;
 case 4: audio.startRecording("4.wav", 16000, A0); break;
 case 5: audio.startRecording("5.wav", 16000, A0); break;
 case 6: audio.startRecording("6.wav", 16000, A0); break;
 case 7: audio.startRecording("7.wav", 16000, A0); break;
 case 8: audio.startRecording("8.wav", 16000, A0); break;
 case 9: audio.startRecording("9.wav", 16000, A0); break;
 case 10: audio.startRecording("10.wav", 16000, A0); break;
 }
 }
 }
 ////////////////////////////////////////
 else if (reading == HIGH) {
 recmode = 0;
 Serial.println("Hung-Up");
 switch (audiofile) {
 case 1: audio.stopRecording("1.wav"); break;
 case 2: audio.stopRecording("2.wav"); break;
 case 3: audio.stopRecording("3.wav"); break;
 case 4: audio.stopRecording("4.wav"); break;
 case 5: audio.stopRecording("5.wav"); break;
 case 6: audio.stopRecording("6.wav"); break;
 case 7: audio.stopRecording("7.wav"); break;
 case 8: audio.stopRecording("8.wav"); break;
 case 9: audio.stopRecording("9.wav"); break;
 case 10: audio.stopRecording("10.wav"); break;
 }
 }
}

NEW CODE - poor quality audio

//////////////////////////////////////// SD CARD
#include <SD.h>
#include <SPI.h>
#include <TMRpcm.h>
#define SD_ChipSelectPin 10
TMRpcm audio;
//////////////////////////////////////// SWITCH CASE
unsigned int i = 0; // # of recording
unsigned long d = 0;
bool recmode = 0; // recording state
//////////////////////////////////////// SWITCH
int inPin = 2; // input Switch Pin
int state = HIGH; // the current state switch
int reading; // the current reading from the switch
void setup() {
 //Serial.begin(9600);
 pinMode(A0, INPUT); // Microphone
 pinMode(inPin, INPUT_PULLUP); // Switch
 //////////////////////////////////////// SD CARD
 SD.begin(SD_ChipSelectPin);
 audio.CSPin = SD_ChipSelectPin;
}
void loop() {
 char buffer[50];
 sprintf(buffer, "%i.wav", i++);
 reading = digitalRead(inPin);
 ////////////////////////////////////////
 while (d < 300000) {
 d++;
 }
 d = 0;
 ////////////////////////////////////////
 if (reading == LOW) {
 if (recmode == 0) {
 recmode = 1;
 //Serial.println("Recording");
 audio.startRecording(buffer, 1600, A0);
 //Serial.println(buffer);
 }
 }
 ////////////////////////////////////////
 else if (reading == HIGH) {
 recmode = 0;
 //Serial.println("Hung-Up");
 audio.stopRecording(buffer);
 }
}

Answer 1

Old code:

audio.startRecording("1.wav", 16000, A0);

New code:

audio.startRecording(buffer, 1600, A0);

Spot the typo?

• TSauer52: Thank you, I have no idea how I missed that (16000)
• Majenko: Easily done. It just takes a fresh pair of eyes.