I use so-called analog or mechanical sound machines like the Marpac or Yogasleep Dohm, so not much use for other noise generation stuff. But every now and then

I use so-called analog or mechanical sound machines like the Marpac or Yogasleep Dohm, so not much use for other noise generation stuff. But every now and then I use an app when I don't have my machines, which I sometimes travel with.