I definitely noticed it in NEMESIS.
Another change in his voice actually accrued much earlier, though I may put that to Stewart's acting. In the first season of TNG there's something about his line delivery that's very different. More stern and curt. By the second season his voice started to sound more relaxed, which I suppose was around the time Stewart was loosening up. He talked about how during the first season he didn't take a residency in LA for a year, instead staying at a hotel because he was told to expect TNG to be a one season show. He was also serious on set and didn't take to goofing off like his cast. You can see on bloopers by the second season he was taking the job less seriously. Those bloopers are GOLD.
Another change in his voice actually accrued much earlier, though I may put that to Stewart's acting. In the first season of TNG there's something about his line delivery that's very different. More stern and curt. By the second season his voice started to sound more relaxed, which I suppose was around the time Stewart was loosening up. He talked about how during the first season he didn't take a residency in LA for a year, instead staying at a hotel because he was told to expect TNG to be a one season show. He was also serious on set and didn't take to goofing off like his cast. You can see on bloopers by the second season he was taking the job less seriously. Those bloopers are GOLD.