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[tech]loop sample?
 

offline big from lsg on 2008-01-11 10:16 [#02162522]
Points: 23711 Status: Lurker | Show recordbag



if i have a sample of a synth that i recorded and i want to
loop, what's the easiest way of looping it without getting a
pop?
do i have to crossfade every ending to beginning?
what's your method?


 

offline _awt_ from Malmö (Sweden) on 2008-01-11 10:18 [#02162524]
Points: 2202 Status: Regular



zoom in with a wave editor and cut the end and start
"perfectly" and it might work, but it really depends on the
sound.


 

offline _awt_ from Malmö (Sweden) on 2008-01-11 10:20 [#02162525]
Points: 2202 Status: Regular



and by "cut" I mean cut it so that the soundwaves "fit" at
the end and start, a short short fadeout/in at the end/start
is probably needed to, the shorter the better but that
depends on the character of the sound.. just my way of doing
it..


 

offline big from lsg on 2008-01-11 10:22 [#02162526]
Points: 23711 Status: Lurker | Show recordbag



right i did this but made a mistake, i'm now going to try
(mistake was it didn't snap to the beginning en end of the
bars)


 

offline freqy on 2008-01-11 10:30 [#02162531]
Points: 18724 Status: Regular | Show recordbag



use an envelope in a sampler and trigger via midi.. alter
attack and release and it will create a smooth transition
between end and start.

your music is so fine i thought you'd know that...y probably
do ,.....anyway wheres our big music bundle? thought you
were gonna make a collection of big tracks.?


 

offline big from lsg on 2008-01-11 10:34 [#02162532]
Points: 23711 Status: Lurker | Followup to big: #02162526 | Show recordbag



im already tired of this

freqy: my first album (with old tracks) will be out this
month


 

offline roygbivcore from Joyrex.com, of course! on 2008-01-11 10:34 [#02162533]
Points: 22557 Status: Lurker



all you need to do is have the wave form start and end at
the same spot (vertically) in the loop

examples:

/\/\/\/ NO
/\/\/\ YES


 

offline big from lsg on 2008-01-11 10:57 [#02162536]
Points: 23711 Status: Lurker | Followup to roygbivcore: #02162533 | Show recordbag



this didn't work perfectly either, maybe it's these lfo
sweeps in the preset of the synth


 

offline big from lsg on 2008-01-11 10:58 [#02162538]
Points: 23711 Status: Lurker | Show recordbag



by screwing around a bit with the beginning and ending i got
a good fit, but i don't know wether that'd give trouble when
i'd loop the sample through a whole track



 

offline futureimage from buy FIR from Juno (United Kingdom) on 2008-01-11 10:59 [#02162539]
Points: 6427 Status: Lurker



Get it to cross zero (as in start and end on zero)


 

offline big from lsg on 2008-01-11 11:03 [#02162540]
Points: 23711 Status: Lurker | Followup to futureimage: #02162539 | Show recordbag



you didn't work, plopped

next time im not going to be lazy and just play the loop for
a few minutes/the whole song


 

offline dave_g from United Kingdom on 2008-01-11 11:05 [#02162541]
Points: 3372 Status: Lurker



The pop is a transient caused by the start and stop points
being out of phase. i.e. if end is at a maximum and start is
at a minimum, you get a big transient from max to min in a
period of 1/sampling freq, i.e. quickly... pop!

To get rid of the pop, make sure that the start and stop
align like said above.
For longer evolving samples, it is difficult if the timbre
changes. To get round this you need to crossfade the start
and stop. At the loop point the sound should be 50% of each
waveform, i.e. half from the end and half from the
beginning. Hope that makes sense.

If your editor cannot do it automatically, you can do it
yourself:
fade out the last second of the end of the loop, cut it to
clipboard.
fade in the first second of the loop and mix paste the end
bit over it.
Now make the loop points equal to the start of the new
(mixed)start and end of the new (shortened) end.



 

offline freqy on 2008-01-11 11:51 [#02162554]
Points: 18724 Status: Regular | Show recordbag



unless this pop is present in the wav? but thats to
obviously silly of me .

you say you got lfos running too ...is that post recording?

try turning them off see if mr.pop goes away?

try importing the loop into a fresh sequencer project try
see if it clears up.

look forward to your music ..i'll probably be paper
decorating to the sounds in my new home. might be off net
for a week or two. but shall d/l em asap.



 

offline hedphukkerr from mathbotton (United States) on 2008-01-11 12:20 [#02162562]
Points: 8833 Status: Regular



if you really cant get crossing zero to work (which it
should) then you can always zoom in and select small bits at
the beginning and end of the loop and fade them in/out.


 

offline big from lsg on 2008-01-11 19:04 [#02162652]
Points: 23711 Status: Lurker | Show recordbag



okay
i wonder: the sine thingy has to be at the same levels to
not plop, but does the slope need to be continued as well?

the rest of your advice i kinda know already, and i wondered
about a really fast working method for fl studio becuase
when you cross fade you need the sample to be a bit longer
and the loop isn't one bar, or one loop, in length anymore.
similarly when you let the sine wave connect you make the
sample a bit longer or shorter and the length is wrong,
unless the difference is so small it's not noticable?


 

offline hedphukkerr from mathbotton (United States) on 2008-01-11 19:25 [#02162655]
Points: 8833 Status: Regular | Followup to big: #02162652



preferably you would want the wave to have at least a
similar slop, but having it both starting and ending on zero
is most important.

also, dont bother trying to loops in fl studio - the editor
just isnt that good. use a standalone wave editor like
audacity to get your loops right, then throw them into fl.


 

offline big from lsg on 2008-01-11 20:19 [#02162668]
Points: 23711 Status: Lurker | Followup to hedphukkerr: #02162655 | Show recordbag



maybe the new edison editor in fl 7 is good enough, it can
zoom into enough? i'll try it in soundforge though


 


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