_SNDBAL

The _SNDBAL statement attempts to set the balance or 3D position of a sound.

Syntax

_SNDBAL handle&[, x!][, y!][, z!][, channel&]

Parameters

• handle& is a valid sound handle created by the _SNDOPEN function.
• x! distance values go from left (negative) to right (positive).
• y! distance values go from below (negative) to above (positive).
• z! distance values go from behind (negative) to in front (positive).
• channel& value 1 denotes left (mono) and 2 denotes right (stereo) channel (beginning with build 20170811/60)
  • The ability to set the balance per channel is gone in version 3.1.0 and higher.
    

Description

• Attempts to position a sound in 3D space, or as close to it as the underlying software libraries allow. In some cases, this will be true 3D positioning, in others, a mere volume adjustment based on distance alone.
• Omitted x!, y! or z! SINGLE values are set to 0 or not changed in build 20170811/60 onward.
• By setting the x! value to -1 or 1 it plays the sound at full volume from the appropriate speaker.
• Sounds at a distance of 1 or -1 are played at full volume. Sounds further than a distance of 1000 cannot be heard.
• The volume decreases linearly (at a constant gradient) over distance. Half volume = 500.
• An "Illegal Function Call" error can occur if another sound is using the primary or same channel position.
• Opened sound files must have the "VOL" capability to use this statement in versions before build 20170811/60.
• Version 3.1.0 enables this for "raw" sounds.

Examples

Example 1: This example loads, plays, and then bounces the sound between the left and right channels.

' This examples load, plays and then bounces the sound between the left and right channels Laff& = _SNDOPEN("KONGlaff.ogg", "stream") 'load sound file and get LONG handle value IF Laff& > 0 THEN _SNDPLAY Laff& 'play sound ELSE PRINT "Failed to load sound file." END END IF PRINT "Press ESC to stop." dir = 0.01 DO IF laffx! <= -1 THEN dir = 0.01 IF laffx! >= 1 THEN dir = -0.01 laffx! = laffx! + dir LOCATE , 1: PRINT USING "Balance = ##.##"; laffx!; _SNDBAL Laff&, laffx! 'balance sound to left or right speaker _LIMIT 60 LOOP WHILE _SNDPLAYING(Laff&) AND _KEYHIT <> 27

Example: Loading a sound after build 20170811/60 - no need to specify "sound capabilities" in _SNDOPEN.

s& = _SNDOPEN("song.ogg") PRINT "READY"; s& _SNDPLAY s& _SNDLOOP s& xleft = -1 xright = 1 DO k$ = INKEY$ SELECT CASE k$ CASE "f" xleft = xleft - 0.1 _SNDBAL s&, xleft, , , 1 CASE "g" xleft = xleft + 0.1 _SNDBAL s&, xleft, , , 1 CASE "h" xright = xright - 0.1 _SNDBAL s&, xright, , , 2 CASE "j" xright = xright + 0.1 _SNDBAL s&, xright, , , 2 CASE "n" volume = volume - 0.1 _SNDVOL s&, volume CASE "m" volume = volume + 0.1 _SNDVOL s&, volume CASE "p" _SNDPAUSE s& CASE " " _SNDPLAY s& CASE "i" PRINT _SNDPLAYING(s&) PRINT _SNDPAUSED(s&) SLEEP CASE "b" _SNDSETPOS s&, 110 CASE "l" _SNDLIMIT s&, 10 PRINT "LIM" SLEEP CASE "k" _SNDSTOP s& CASE "c" _SNDCLOSE s& SLEEP s2& = _SNDOPEN("song.ogg") CASE "d" s2& = _SNDCOPY(s&) _SNDPLAY s2& END SELECT LOCATE 1, 1 PRINT xleft, xright, volume, _SNDGETPOS(s&); " " LOOP

Code by Johny B

See also

• _SNDOPEN, _SNDOPENRAW
• _SNDVOL, _SNDLIMIT

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