Doofus,
Be aware that tautech is associated with Siglent, as nice as he is, so bear this in mind with responses about comparing to other manufacturers.
As far as Audio is considered, I've pretty amazed at how useful Audacity is using the "Plot Spectrum" function (which is effectively what you're seeing with FFT). This is just using a £1 USB Sound Card dongle, and the free open source Audacity software.
Also, as far as compensation issues only affecting "old" Siglent 1202xe, that is not entirely true. We are led to believe that due to shipping times, and general stock control that there are enough stocks held globally by distributors and resellers that you cannot guarantee at this stage whether you will get one with the probe compensation hardware fault or not.
As far as Audio is concerned, JohnAudioTech in Youtube does an excellent job using FFT on his Rigol scope.
Trys