OMChroma User ManualPredefined Classes > Sampler > Reading from a sound file > Reading from a Sound file with SMPL-2

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Reading from a Sound file with SMPL-2

Tutorial SMPL-2

Specific Slots

Name	Description	Default value
amp	Maximum Amplitude. Linear from >0.0 to 1000 or in dB from 0 to -∞ (see Tutorial Getting Started 02 - Amplitude and Internal Editor for more details)	0.0
f0	Transpose the pitch of input sound by this factor (e.g. 0.5 means one octave lower, 2 is one octave higher, and 1 is the original pitch). Fractional and negative values are allowed (the latter results in playing the file backwards)	-1.0
afil	Audio file [name, with possible path, sound, string, pathname or GEN01]	File: santuri_96
skip	(Minimum) starting point when reading an audio file in [%]	0.0
aenv	Amplitude Envelope [GEN]	Instance: GEN07
win	Attack and decay time in [sec]	0.01
wrap	Wrap flag: 0=locations beyond EOF produce silence, <>0=wrap from beg of file	1

Class description

The SMPL-2 Class is a Sampler similar to Smpl-1 with the following controls:

The main ampllitude,
The transposition factor,
The starting point of the audio file,
The amplitude envelope by means of a GEN routine,
The attack and decay time of the total duration of the amplitude envelope,
The wrapping mode (enable or disable).

Reminder

The only different between SMPL-1 and SMPL-2 is the skipping allocation. In SMPL-1 the skip time is set to an absolute value (e.g. in seconds), instead in SMPL-2 is set in relative value as a percentage and that is really useful for reverse playing.

Patch description

The example A employs the SMPL-2 instead the example B employs SAMPL-1 with the same given data. How you can see the difference is the relative skip time of SMPL-2.

Reminder

The meaning of the other slots is the same as the SMPL-1 Class. So see the Tutorial SMPL-1 for more details.

Common Red Patches

For the red patch C#ed and Synt see Appendix A

Inside the Class

Csound Orchestra of the SMPL-2 Class.

instr 1

idur = p3

idurosc = 1/idur

iamp = (p4 > 0.0 ? (p4*0.001) : (10 ^ (p4/20.0)))

; relative amplitude to the sound file (to avoid multiplying twice)

if0 = p5 ; transposition factor

ifile = p6

;ifilepeak filepeak ifile ; take away the semicolons if you want to read the

;print ifilepeak ; max amp of the file on the terminal

iskip = (p7 < 0.0 ? (p7*if0) : p7)

; to make the value not depend on the xposition factor if it's negative

iaenv = p8 ; global amplitude envelope

iwin = (p9 > idur/2 ? idur/2 : p9) ; local envelope

iwout = iwin

ixmode = 1 ; index between 0 and 1

ixoff = 0 ; index offset

ixrap = 0 ; no wraparound in table reading

iwrap = p10

iformat = 8 ; 24-bit int, ignored if the sound file has a header

iwsize = 512 ; the bigger, the better the quality of the transposition

ibufsize = 262144 ; maximum = 1048576, higher makes less disk access

iskipinit = 0 ; do not skip initialization

isigfun = 19 ; sigmoid function

; local envelope (for the grain)

k1 linen 1,iwin,idur,iwout

k2 tablei k1,isigfun,ixmode,ixoff,ixrap

; global envelope

k3 poscil iamp, idurosc, iaenv

; file reading

a1 diskin2 ifile, if0, iskip, iwrap, iformat, iwsize, ibufsize, iskipinit

asound = a1*k2*k3

outc asound

endin

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