The band's drummer has just bought an acoustic kit with us having previously rehearsed and played live with an electronic Roland version. We need to be sure that this would not affect our hearing, and we were also trying different setups with backline vs our normal PA.
These earplugs are an excellent choice for lowering volumes yet retaining clarity. We had some concern that our singer would hear too much 'inner head' voice, and whilst this does occur, it was very quick to get used to and had no adverse effect on pitch or level of singing. We also found that the guitars and bass were not muffled, simply less noisy. Again, clarity of bass and treble were retained to all band members.
In-ear monitoring is a consideration for the future, but these ear buds are a fantastic intermediate step, especially for the price.
Our initial fears quickly dsimissed, we were able to concentrate on the playing and setup combinations.