I have several .wav files of audio test tones that I'm using for a design project. The problem is that they're way too short, either one or two seconds. What can I use to make them as long as I want?
If the tone frequency doesn't change at all, you can just copy and paste in a wav editor like audacity or soundforge. If it does change tho, your best solution would be to timestretch, though understand this may also affect the pitch.