Yes, I understand the problem Dave; which end! Clear scientific analysis is required about the potential ease/difficulty of operation and about the effectiveness of the proposed action! There is also the question of the effectiveness of the delivery method in stage 2 of the operation, not to mention the adequacy of the necessary remedial measures that are required in stage 3. The world is beset by such grave concerns!
I once had a similar problem with an electric base player. I am afraid that there has to be a little suffereing but the problem was resolved by a gentle turning of the volume knob to near zero. Unfortunately that ment sitting near enough the amp to keep tweeking it! Do it steadily amd in small enough stages and they think that their amplifier has developed a fault as in "I can't understand this my guitar is getting quieter!" Alas the base player did not take the next logical step, viz giving the thing a good kick.