I can't remember which version specifically, but I remember it being by Sonic Foundry, so maybe Acid Pro 4. Such a great, innovative piece of software for the time! Back then I used to make mashups; vocals from one track layered over instrumentals of another, so I think my earliest projects probably were mashups!
I think I was about 12 or 13 the first time I found AP. I was using Acid Pro 4 and Sound Forge. In AP4 you couldn't easily split the left and right track or reverse a sample, so you had to use Sound Forge to split the left and right channels and reverse samples. That's all I ever used Sound Forge for, and quickly stopped using it as soon as AP5 came out where you could split channels with a couple mouse-clicks.
2004 I got a tip from an A&R guy at Universal in Sweden when making a party mix for Alcazar(best of tracks megamix)...you can listen to it on Spotify(Dancefloor Deluxe)...he played me some crazy mash-up rnb and hip hop music made with I think Acid 3..and my jaw dropped like woohoo!::)) so the mix was created using both Acid and Magix Music Maker at the time...I have been a fan of Magix since MMM7:)
Later on I made some remixes for Alcazar as well...Stay the night - FL club mix (also on Spotify) and now I'm remixing their new euro pride track for this summer 2018 and hopefully they will like it...made with acid pro 7...and 8!
..."stay the night" made with Magix Music Maker 2005 and Acid...I think it was number 5
Acid Music Studio 10. After dragging my feet because of the mostly negative feedback I had heard I finally bought it. In the 3 years since I've added Pro 7 and 8, this time disregarding what I'd read and heard. Never made a better decision in my life.
Acid1! I was going to art school at the time and a friend was going to a local music school for production. He brought it over and put it on my pc. Eventually the rest of the squad got hooked also, lol. Them was the daaaaaayz.
I found the Sonic Foundry site in 1999 and downloaded v 2.0. They were running a Beck Remix contest, so I downloaded the loops, did a remix and tied for third place! Been a dedicated Acid head ever since.
I started right at the beginning. Worked as an intern at Sonic Foundry for a month over break from college. They let me try ACID out before it was released. I was hooked. It definitely lit the spark which has led to over 20 years of producing music.