Path: utzoo!utgpu!water!watmath!clyde!att!mtune!mtund!newton
From: newton@mtund.ATT.COM (Newton Lee)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Setting the Sound Volume (XFCN)/ Control Panel
Keywords: Sound,Volume,Control,Panel
Message-ID: <1032@mtund.ATT.COM>
Date: 31 Aug 88 13:16:56 GMT
References: <550@vulet.let.vu.nl.UUCP>
Organization: AT&T ISL Middletown NJ USA
Lines: 17

In article <550@vulet.let.vu.nl.UUCP>, koster@let.vu.nl (C. Koster) writes:
> I made a XFCN that does a simple SetSoundVol. Works fine. But when I check
> with the General or Sound control panel device it shows the old SoundVol.

When I change the sound volume on Mac SE, I do (in C):

	SetSoundVol(volume);
	SysParam = GetSysPPtr();
	SysParam->volClik = (sysParam->volClik & 0xF8FF) | (volume << 8);

The first line sets the speaker volume to the specified level but it
doesn't change the volume setting in the control panel. The second and
third lines adjust the control panel volume setting by changing the
parameter RAM.

Newton Lee
AT&T Bell Laboratories