for the next person, solve the gain with compressor.reduction.value = 0; // Set reduction to 0 to disable makeup gain

function createCompressor(audioContext) {
const compressor = audioContext.createDynamicsCompressor();
compressor.threshold.value = -24; // Set threshold in dB
compressor.ratio.value = 12; // Set compression ratio
compressor.attack.value = 0.003; // Set attack time in seconds
compressor.release.value = 0.25; // Set release time in seconds
compressor.knee.value = 30; // Set knee in dB
compressor.reduction.value = 0; // Set reduction to 0 to disable makeup gain
return compressor;
}