05737: choplift and clones: digitized speech is pitched too high

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
05737	Sound	Minor	Always	Oct 17, 2014, 00:34	Dec 11, 2014, 17:00

Tester	zaxxon	View Status	Public	Platform	MAMEUI
Assigned To		Resolution	Open	OS	Windows Vista/7 (32-bit)
Status [?]	Confirmed			Driver	sega/system1.cpp
Version	0.155	Fixed in Version		Build	Normal
		Fixed in Git Commit		Github Pull Request #

Summary	05737: choplift and clones: digitized speech is pitched too high
Description	hi, for the game choplifter (8751 315-5151) (note: i cannot test the clones for this game), the digitized speech is pitched too high in mame. listen to the two attached .wav recordings comparing the pcb version against the mame version. here is a video of the choplifter pcb where you can hear the digitized speech:
Steps To Reproduce
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	choplift and clones

Attached Files	pcb_choplifter.wav (1,653,718 bytes) Oct 17, 2014, 00:34 Uploaded by zaxxon .wav sound file of choplifter pcb version
Attached Files	mame_choplifter.wav (1,982,214 bytes) Oct 17, 2014, 00:36 Uploaded by zaxxon .wav sound file of choplifter mame version

No.11094 B2K24 Senior Tester Oct 17, 2014, 05:34	The bootleg and unprotected set seem to sound identical as the Parent (choplift) These sets give you warnings about "NO GOOD DUMP KNOWN" and "ROM NEEDS REDUMP" With that said, it definitely seems like the reported behavior can be confirmed.
No.11278 zaxxon Tester Dec 4, 2014, 16:12	an added note for this report: in order for the mame speech to match the arcade speech in pitch/speed, the pitch/speed of the speech in mame would need to be reduced by 25%
No.11291 darq Tester Dec 11, 2014, 17:00	This problem should be related to the SN76489 sound slices. I don't know how to fix it in MAME (and whether or not is it possible with current implementation), but if you increase the sound slices (I tried for example from 256 to 280 slices per frame), you will get the correct pitches.