Does the Bose L1 Pro8 have reverb?

Yes, reverb is available on the L1 Pro8 (and Pro16 and Pro32, the S1 Pro and S1 Pro+ as well).

You can adjust the reverb on channel 1 and channel 2 on the L1 Pro8, or you have even more control if you connect the T4s or T8s Tonematch mixers.

Read more about the L1 Pro8 reverb feature here.