Press the plus button, choose first track from your Spotify, add more tracks

Find matching tracks. For a smoother mix, pick a track with a higher Match Score

More screenshots from‏‏‎ ‎

Pacemaker

App Store screenshots
Login with Spotify
Top level tabs
In app purchase
Add filters to your mix
Onboarding
Coach marks

More‏‏‎ ‎

Creation

Create Group
Create deck
Receiving and sending a letter
Request to sell art