SID issue synthezised voices

[Eddepad]

Commodore 64 Ultimate SW 3.14 from 2025-11-10

When I play the titles The Last v8 or Air Combat Emulator (ACE) the digitized voices are not heard on my speakers (UltiSID). I tried many different settings in the UI, but no luck. Maybe someone with the Ultimate can confirm this also. The voice in the game Ghostbusters, for example, is well present.

EDIT 27-12-2025:
I see this issue is also mentioned on the 1541ultimate:
GideonZ/1541ultimate#544

EDIT 18-01-2026, my partial quote on Lemon64.com:
Five a-side Football from Artworx Anirog. The version where the soccer game starts with the voice "Here we go!" (5 times one after another). And here's the strange thing. There are two versions of the game. With the announcement voice and without (Mastertronic and Artworx). When there is a goal, the voice says "He scores!". And you hear that voice in the Mastertronic version and that same voice is not heard in the Artworx version.

[C64Mat]

Old SID sampling techniques on old commercial software largely work fine here, with the exception of The Last V8, which weirdly sounds corrupted. Other speech, such as that found in Impossible Mission, Myth, The Ninja Warriors, Exploding Fist all sound just as they did on original hardware (note that you can go into the audio menu and increase the volume of samples specifically, which is great if you're using the 8580 sound emulation).

But whatever techniques modern developers use to create their SID samples, they don't appear to work well on the Ultimate at all. A Pig Quest "Piggy 18" intro speech sounds messy and crunchy. The speech for Planet Golf has the same issue, often being absolutely unintelligible on the course, when it would normally say things like "It's all about gravity". You can barely make it out. The "Let's Golf!" speech before playing a round is garbled and pitch shifted up at least an octave. The "SEGA" speech at the start of Sonic the Hedgehog 2 is messy. None of these issues appear either on original C64s OR software emulators like Vice, where all the speech sounds clear and great.

It's the one mar on another wise excellent product.