T STATEMENT (TEMPO STATEMENT) 

     t  p1  p2  p3  p4  .....  (unlimited) 

This statement sets the tempo and specifies the accelerations and
decelerations for the current section.  This is done by
converting beats into seconds.  


PFIELDS

     p1             must be zero 
     p2             initial tempo in beats per minute 
     p3, p5, p7, ...     times in beats (in non-decreasing order) 
     p4, p6, p8, ...     tempi for the referenced beat times 


SPECIAL CONSIDERATIONS 

Time and Tempo-for-that-time are given as ordered couples that
define points on a "tempo vs time" graph.  (The time-axis here is
in beats so is not necessarily linear.) The beat-rate of a
Section can be thought of as a movement from point to point on
that graph: motion between two points of equal height signifies
constant tempo, while motion between two points of unequal height
will cause an accelarando or ritardando accordingly.  The graph
can contain discontinuities: two points given equal times but
different tempi will cause an immediate tempo change.  

Motion between different tempos over non-zero time is inverse
linear.  That is, an accelerando between two tempos M1 and M2
proceeds by linear interpolation of the single-beat durations
from 60/M1 to 60/M2.

The first tempo given must be for beat 0.

A tempo, once assigned, will remain in effect from that
time-point unless influenced by a succeeding tempo, i.e.  the
last specified tempo will be held to the end of the section.

A t statement applies only to the score section in which it
appears.  Only one t statement is meaningful in a section; it can
be placed anywhere within that section.  If a score section
contains no t statement, then beats are interpreted as seconds
(i.e. with an implicit t 0 60 statement).

N.B.  If the csound command includes a -t flag, the interpreted
tempo of all score t statements will be overridden by the
command-line tempo.


Patrick Pagano wrote:
> 
> hi folks
> how do i properly use a t statement
> I seem to have no trouble assigning one say    t 0 120
> but say I want the notes beginning at second 10 to be t 10 30
> do i need to put a comma or successive lines?