First of all thanks for the forum posts. I learnt a great deal from this site. My mother was diagnosed with PSP couple of years ago. There has been a deterioration in her speech, specifically volume in the past 6 months. She is very coherent but a very low volume. I am looking for a recommendation on the speech amplifiers. There seems to be two categories of products on the market- those that enhance voice for in-class instruction purposes and the 2nd category which interests me is to address speech amplification for those suffering from vocal problems that impact volume. I found a list on Internet which is attached. None mention PSP but some mention Parkinson such as Spokeman luminaud.com/spokeman_amp. I appreciate any comments on the use of any speech amplifier product. Thanks in advance.