Does anyone use an acapella?

Hi skyfall1 - while I'm hopeful others in the community will reply to your inquiry - we are familiar with the acapella device and other devices like it.
All the best,
Leon (site moderator)

Hi again,skyfall1. In view of your interest in the acapella type of device, I thought you might find it interesting to look over this question posted by one of our other community members four weeks ago: https://copd.net/q-and-a/aerobika-device/. Please let us know if you found this to be helpful to you. Warmly, Leon (site moderator)