if you want to make it sound professional you might want to use a daw or potentially audacity.
most daws are kinda pricy though, but you could look up reaper or lmms for free alternatives (not entirely sure if they can do the job, since I haven't tried them, but I imagine they should work)
just google reaper daw or lmms daw
fl studio should definitely do the job if you're willing to learn how to use it, but it costs quite a bit of money.