Greetings and welcome to the forum.
Cakewalk by BandLab, or CbB for short, uses Melodyne and the ARA communication protocol built into both Melodyne and Cakewalk by BandLab to convert audio to midi.
If you do not have Melodyne, no problem. Use the BandLab Assistant to download and install the specific to Cakewalk Melodyne trial version. The trial version that is specific to Cakewalk differs from the trial version available from Celemony’s website. At the end of the thirty day period, the Cakewalk specific Melodyne trial continues to provide audio to midi conversion of a monophonic audio file.
I’ve quoted below from page 999 of the Cakewalk Reference Guide. The quote offers instructions for converting audio to midi. I’ve also provided a link to the Cakewalk Reference Guide.
Blockquote To convert audio to MIDI do one of the following:
Simply drag the Melodyne Region FX clip to a MIDI or Instrument track.
Select the Melodyne Region FX clip, then select Region FX > Melodyne > Copy MIDI Events on the Track view menu. You can then paste the data to a MIDI or instrument track.
Right-click the Melodyne Region FX clip and select Region FX > Melodyne > Copy MIDI Events on the pop-up menu. You can then paste the data to a MIDI or instrument track.
Drag an audio file from the Browser and drop it on a MIDI or Instrument track.
Drag an audio clip to a MIDI or Instrument track.
Tip: For the best results when converting audio to MIDI, first convert the audio to a Melodyne Region FX, then use the Melodyne interface to precisely identify the desired notes/beats. You can then drag the Melodyne Region FX clip to a MIDI or Instrument track and get predictable results.