Stop bouncing
stems by hand.

StemStack automates the stem bounce workflow in Logic Pro. Set up your stem groups once (Drums, Bass, Guitars, Vocals, etc.), click one button, and StemStack solos each group, triggers Logic's bounce dialog, names the file, and moves to the next stem — hands-free.

Logic Pro on macOS. StemStack works alongside Logic, not inside it — you'll have both open at the same time.

macOS 14 (Sonoma) through macOS 15 (Sequoia), and Logic Pro 11 or later.

StemStack uses macOS's Accessibility API to control Logic Pro on your behalf — soloing tracks, triggering the bounce dialog, and confirming file names. This is the same category of permission screen recorders and automation tools use. StemStack doesn't function without it, and it doesn't access anything outside of controlling Logic's interface.

1. Open the DMG and drag StemStack into your Applications folder. This step matters — StemStack must be located in Applications in order for macOS to correctly prompt you for Accessibility permissions. If it's run from anywhere else (like directly from the DMG or Downloads), the permission prompt may not appear properly.
2. Open StemStack from Applications. When prompted, grant Accessibility permission in System Settings → Privacy & Security → Accessibility. This is required for StemStack to control Logic Pro.

This usually comes down to your Logic project's layout relative to your screen size — StemStack occasionally has trouble locating the right controls if the track inspector is collapsed or the window layout is unusually compact. Try expanding the inspector panel and running the bounce again — this resolves it in the large majority of cases. If it still doesn't work, email us with your screen resolution and Logic window layout and we'll help troubleshoot.

No — StemStack only interacts with Logic's interface to trigger actions you'd otherwise do manually (soloing, bouncing). It doesn't touch your project file or audio data directly.

Yes — file names are generated from your project name and stem group names, based on a naming convention you set.

StemStack works no matter how your session is set up — but a couple of habits make it faster:

• Use standard track names (e.g. "EL GTR," "Drums," "EL Bass") — this helps StemStack auto-suggest stem group names for you instead of you naming them manually.
• Group instrument sections into track stacks when you can (e.g. Kick, Snare, Hat, and a percussion loop grouped into a track stack called "Drums," then collapsed). That way you only have one track to drag into a stem group, and StemStack will pick up that grouping automatically.

Neither is required — you can always build your stem groups manually regardless of how your session is organized.

StemStack is a one-time purchase — no subscription. Each license activates on one Mac.

Not working for your setup? Email support@stemstackapp.com within 30 days for a full refund. Just include your macOS and Logic Pro versions and a video of what's failing so we can make the product better.

You'll receive your activation license key by email when you purchase the app. The first time you open StemStack, you'll be prompted to enter this license key to activate it on your computer.

Email support@stemstackapp.com with what happened and your macOS/Logic Pro version. StemStack is under active development and real bugs get fixed fast. You're also always covered by the 30-day refund if it's not working for you in the meantime.