hi all -

i cannot understand something which i thought is easy.  i want to change 
a global variable for volume from 1 to 0 or vice versa, whenever i 
trigger an instrument.  but the change should perform as a line in the 
duration of the instrument:





ksmps = 32

   instr Master
gkVol init 1
printk .5, gkVol
   endin

   instr MuteUnmute
iStart = i(gkVol)
iEnd = (iStart == 0 ? 1 : 0)
print iStart, iEnd
gkVol linseg iStart, p3, iEnd
   endin



i "Master" 0 5
i "MuteUnmute" 1 .1
i "MuteUnmute" 2 .1
i "MuteUnmute" 3 .1
i "MuteUnmute" 4 .1



i expected to get gkVol down to zero after the first call of MuteUnmute, 
then back to 1 after the second call, and so on.  but i get:

new alloc for instr Master:
  i   1 time     0.00073:     1.00000
  i   1 time     0.25034:     1.00000
  i   1 time     0.75029:     1.00000
B  0.000 ..  1.000 T  1.000 TT  1.000 M:      0.0
new alloc for instr MuteUnmute:
instr 2:  iStart = 1.000  iEnd = 0.000
  i   1 time     1.25025:     0.00725
  i   1 time     1.75020:     0.00725
B  1.000 ..  2.000 T  2.000 TT  2.000 M:      0.0
instr 2:  iStart = 0.007  iEnd = 0.000
  i   1 time     2.25016:     0.00005
  i   1 time     2.75011:     0.00005
B  2.000 ..  3.000 T  3.000 TT  3.000 M:      0.0
instr 2:  iStart = 0.000  iEnd = 0.000
  i   1 time     3.25007:     0.00000
  i   1 time     3.75002:     0.00000
B  3.000 ..  4.000 T  4.000 TT  4.000 M:      0.0
instr 2:  iStart = 0.000  iEnd = 0.000
B  4.000 ..  4.100 T  4.100 TT  4.100 M:      0.0
  i   1 time     4.25070:     0.00000
  i   1 time     4.75066:     0.00000
B  4.100 ..  5.000 T  5.000 TT  5.000 M:      0.0

i thought it might be because the line does not reach exactly the zero 
(although it should), so i added some time to p3, but this did not help 
at all.

am i overlooking anything obvious, or is something wrong with linseg?

thanks -
	joachim

Csound mailing list
Csound@listserv.heanet.ie
https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
Send bugs reports to
        https://github.com/csound/csound/issues
Discussions of bugs and features can be posted here

thanks for the quick look and the help, rory.  i see now the also
   gkVol linseg iStart, p3-2/kr, iEnd
works.

in a way i was thinking the wrong way; i tried
   gkVol linseg iStart, p3+2/kr, iEnd
which is of course nonsense because then the line definitely cannot 
reach zero ...

thinking is soo difficult ... =)

	j


On 13/07/16 20:06, Rory Walsh wrote:
> Looks like line doesn't quite get to its end points. The modified
> version below works. Is this why there is a linsegb opcode?
>
> 
> 
> 
> 
> ksmps = 32
>
>    instr Master
> gkVol init 1
> printk2 gkVol
>    endin
>
>    instr MuteUnmute
> iStart = i(gkVol)
> iEnd = (iStart == 0 ? 1 : 0)
> prints "iStart=%f iEnd=%f\n", iStart, iEnd
> gkVol linseg iStart, p3-.01, iEnd, .01, iEnd
>    endin
>
> 
> 
> i "Master" 0 5
> i "MuteUnmute" 1 .1
> i "MuteUnmute" 2 .1
> i "MuteUnmute" 3 .1
> i "MuteUnmute" 4 .1
> 
> 
>
> On 13 July 2016 at 18:48, joachim heintz  > wrote:
>
>     hi all -
>
>     i cannot understand something which i thought is easy.  i want to
>     change a global variable for volume from 1 to 0 or vice versa,
>     whenever i trigger an instrument.  but the change should perform as
>     a line in the duration of the instrument:
>
>     
>     
>     
>     
>     ksmps = 32
>
>        instr Master
>     gkVol init 1
>     printk .5, gkVol
>        endin
>
>        instr MuteUnmute
>     iStart = i(gkVol)
>     iEnd = (iStart == 0 ? 1 : 0)
>     print iStart, iEnd
>     gkVol linseg iStart, p3, iEnd
>        endin
>
>     
>     
>     i "Master" 0 5
>     i "MuteUnmute" 1 .1
>     i "MuteUnmute" 2 .1
>     i "MuteUnmute" 3 .1
>     i "MuteUnmute" 4 .1
>     
>     
>
>     i expected to get gkVol down to zero after the first call of
>     MuteUnmute, then back to 1 after the second call, and so on.  but i get:
>
>     new alloc for instr Master:
>       i   1 time     0.00073:     1.00000
>       i   1 time     0.25034:     1.00000
>       i   1 time     0.75029:     1.00000
>     B  0.000 ..  1.000 T  1.000 TT  1.000 M:      0.0
>     new alloc for instr MuteUnmute:
>     instr 2:  iStart = 1.000  iEnd = 0.000
>       i   1 time     1.25025:     0.00725
>       i   1 time     1.75020:     0.00725
>     B  1.000 ..  2.000 T  2.000 TT  2.000 M:      0.0
>     instr 2:  iStart = 0.007  iEnd = 0.000
>       i   1 time     2.25016:     0.00005
>       i   1 time     2.75011:     0.00005
>     B  2.000 ..  3.000 T  3.000 TT  3.000 M:      0.0
>     instr 2:  iStart = 0.000  iEnd = 0.000
>       i   1 time     3.25007:     0.00000
>       i   1 time     3.75002:     0.00000
>     B  3.000 ..  4.000 T  4.000 TT  4.000 M:      0.0
>     instr 2:  iStart = 0.000  iEnd = 0.000
>     B  4.000 ..  4.100 T  4.100 TT  4.100 M:      0.0
>       i   1 time     4.25070:     0.00000
>       i   1 time     4.75066:     0.00000
>     B  4.100 ..  5.000 T  5.000 TT  5.000 M:      0.0
>
>     i thought it might be because the line does not reach exactly the
>     zero (although it should), so i added some time to p3, but this did
>     not help at all.
>
>     am i overlooking anything obvious, or is something wrong with linseg?
>
>     thanks -
>              joachim
>
>     Csound mailing list
>     Csound@listserv.heanet.ie 
>     https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>     Send bugs reports to
>     https://github.com/csound/csound/issues
>     Discussions of bugs and features can be posted here
>
>
> Csound mailing list Csound@listserv.heanet.ie
> 
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to
> https://github.com/csound/csound/issues Discussions of bugs and features
> can be posted here

Csound mailing list
Csound@listserv.heanet.ie
https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
Send bugs reports to
        https://github.com/csound/csound/issues
Discussions of bugs and features can be posted here

=)

On 13/07/16 21:04, Rory Walsh wrote:
>     thinking is soo difficult ... =)
>
>
> Tell me about it. I tried out some thinking in the mid-90s but it put
> such a drain on my mental resources that I had to give it up...
>
>
> Csound mailing list Csound@listserv.heanet.ie
> 
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to
> https://github.com/csound/csound/issues Discussions of bugs and features
> can be posted here

Csound mailing list
Csound@listserv.heanet.ie
https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
Send bugs reports to
        https://github.com/csound/csound/issues
Discussions of bugs and features can be posted here

thinking is soo difficult ... =)

Tell me about it. I tried out som e thinking in the mid-90s but it put such a drain on my mental resources that I had to give it up...  

Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here