MUSIC CALC V1.05  By Steve MacMillan

     Music Calc is a Time Base Calculator, a simple Numeric 
Calculator, and a tool for figuring tape location at a  SMPTE time 
code address by entering Bar or Beat numbers. Conversely, Bar or 
Beat numbers can be computed by entering a SMPTE address. Music 
Calc also will figure delay or DDL timings by song tempo.

     Time Base Mode:
     Time base calculations are useful in adding song running 
times to figure total length (How many songs can I fit on a 
cassette?). Or if a eight-bar song segment is ten seconds long, 
how long is 32 eight-bar segments?
     All time entry are in the 24, 25, and 30 frame SMPTE 
standards (HH:MM:SS:FF). Drop frame is not yet supported. All 
calculations are based on a 24 hour clock. Times may be added or 
subtracted from each other or may be multiplied or divided by real 
numbers.     
    
     Numeric Mode:
     The numeric mode is a simple numeric calculator.

     Tempo Screen:
     By selecting the Tempo key you can enter your song's tempo in 
beats per minute, and the proper time signature can be selected.
Tempo is important for all song position calculations and it 
selects the tempo for the delay window. Several common time 
signatures can be selected or the Other key lets you enter an 
unusual one. The proper time signature is important for all Bar to 
SMPTE calculations and also affects the note value vs. beat per 
minute calculations on the delay window. The Tap key allows Tempo 
to be tapped in on the space bar. After selecting the Tap function 
the first tap on the space bar starts the timer and after 16 more 
taps MUSIC CALC computes the tempo.

     Delay Window:
     The Delay Window shows a list of millisecond timings for note 
values at your selected tempo and time signature. Ex: For a 
quarter note echo to be in time with a song at 120 bpm (4/4 time) 
set your DDL to 500 ms. The Delay Window also computes the time in 
seconds for four bars and the number of frames (@ 24 frames per 
second) per beat. The time in seconds for four bars is useful if 
you don't know the tempo of the song. Time four bars of the song 
and then adjust the Tempo on the Tempo Screen until the 'Time for 
Four Bars' on the Delay Window matches, or much quicker use the 
'Tap' key on the Tempo Screen.  

     Bar # Screen:
     Use the Bar # key to compute song position. You must first 
enter the SMPTE location of Bar ONE of your song. This is done by 
the Start key (click on Start to view current start time and Enter 
to exit, any numeric key starts time entry). All song position 
calculations are referenced to the Start time. 
     The two modes of operation are Calc Bar and Calc Time. With 
Calc Bar you enter either Bar or Beat numbers depending on the Bar 
or Beat keys, and Music Calc computes a SMPTE address. With Calc 
Time you enter a SMPTE address and depending on the Bar and Beat 
keys you get a Bar or Beat number. This can be very useful in 
figuring song length, or tape locations for various song segments. 
Or let's say you had planned on a midi sequence to start at one 
hour SMPTE time (01:00:00:00) and you wanted to add a two bar 
count off to your sequence. You could use Music Calc to determine 
the new start time of your expanded sequence (Calc Bar mode, enter 
-2) to still allow for beat one of the song to land on one hour.

     Stop Watch:
     This is just a simple stop watch accurate to a 100th of a 
second. The space bar starts and stops the clock. The undo key 
will reset the clock either while running or stopped. The return 
key will exit.

     Metronome:
     This is an audible metronome that runs at the tempo selected 
on the Tempo Screen. The return key will exit.

     SMPTE Mode:
     Use the SMPTE Screen to select the Frame Rate for all Time 
based math and Locate functions. The default is 30 frame per 
second. This is the rate used for almost all audio only 
productions. 24 frames per second (Film standard) and 25 frame 
(European EBU standard) are also available. Drop frame (American 
color video standard) is about 29.97 frames per second, and 
currently has me stumped.

     Configure File:
     It is possible to save Tempo, Time Signature, Start Time, and 
SMPTE Frame Rate during program exit by answering 'Yes' to the 
'Save Config. File' query. These settings are automatically loaded 
the next time Music Calc is run.

      I believe Music Calc is accurate but I would love feedback 
as to bugs or desired features. To my knowledge, nothing like this 
exists on the ST and I hope this proves to be a useful program. 
Written in 100% GFA Basic.

            Enjoy!                Genie address...  S.MACMILLAN