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Risc World 3
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Risc World 3.iso
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SOFTWARE
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ISSUE2
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BELLS
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CALLCHANGE
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!CallChnge
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!Help
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2002-04-14
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Running Instructions for the Call changes program.
This Desktop program shows an animated set of Church bells and allows
users to practice 'Call changes' to improve their listening skills and change
the order of ringing of the bells. It is intended for those who are learning
to ring and tries to follow the usual conventions and phrases used in the
tower. A simple explanation of the technique of bell ringing including many
of the terms used are stored in file 'Docs.Intro' (in the application) for
those who are not familiar with the phrases.
Start the program by double-clicking on the !CallChnge icon to load an icon
on to the icon bar. The program detects the screen mode of your desktop
because it only runs in a 16 or 256 colour mode. If your desktop is in some
other mode you will see an error window saying 'Please use a 16 or 256
colour mode'. Click on 'OK' to remove that window and then change the screen
mode before trying again. The program works better in 'multi-sync' modes;
although it may run in other modes you could see bell wheels which are not
circular.
When the icon is loaded on to the icon bar, click <Menu> over it to see
3 options,
Info - displays a small window with program details
Help - displays this window with these running instructions
Quit - stops the program
To Start
Click the <Select> mouse button over the icon on the icon bar to see a
window with title 'Call Changes' where you set up the running parameters
before starting; these are:
- the number of bells to use,
- the key of the tenor,
- the volume of the sound,
- the length of the 'open lead' gap,
- the strike rate.
They are saved in a file from one run to the next.
#bells allows you to change the number of bells by clicking <Select>
on the 'up' or 'down' arrows, or <Adjust> will change the other way.
The minimum number of bells is 5 because the program does a change by
waiting until the two bells to be swapped are both vertical between back-
and handstrokes and then interchanges them. This only happens for 5 or more
bells; with fewer bells two adjacent bells are never vertical at the same
time. We may be able to use fewer bells if enough people ask for it, but
we started with 5 because you cannot make as many different changes on
4 bells.
The maximum number of bells depends on the number of pixels across the
screen since the images are set 64 pixels apart, to use 16 bells you need
a screen width of 1024 pixels.
mode screen width max number of bells
27 640 10
31 800 12
1024 16 (absolute maximum).
Changing the key of the Tenor
Click on the icon next to the comment 'Tenor Key' to see the range of
possible keys expressed in musical notation. Select the one you want which
should then appear in the small icon to the left. (See file 'Docs.Pitch'
for how to make minor adjustments to the pitch.)
Click on the arrow icons next to the Volume icon to change the volume
of the sound (Maximum 15, Minimum 0 ) Asking for zero volume will cause
a warning message 'The bells are silent with volume=0'; this can be
useful if you are checking your calling sequence and do not want to annoy
others around you.
Click on the button towards the bottom of the window labelled 'Try Tenor' to
hear the sound.
Click on the arrow icons next to the 'Open lead' icon to change the pause
before each hand stroke. Values from 0 to 2 in steps of 0.2 are allowed.
The standard open lead has a value of 1 meaning there will be pause of
one blow before the handstroke. Closed leads have a value of 0.
Click on the arrow icons next to the 'Strike rate' icon to change the speed
of ringing. Values of 25 to 35 are allowed. A normal strike rate of 30 means
that about 30 6-bell rounds are rung in one minute. For 12 bells the rate
automatically reduces to about 25 per minute.
Click on the 'Look To' icon to start the animation.
This takes place in a special ringing window which cannot be moved; it takes
all the Wimp time so that the ringing speed is not affected by other Wimp
activities which might be taking place.
At the bottom of the green ringing window there are instructions telling you
how to change the order of ringing.
At the top of the window you see your ringers and their bells ready to
start ringing rounds; in this simulation, for simplicity all the bells and
their wheels are the same size although they each have a different pitch; in
a real tower the higher pitched bells are smaller with correspondingly
smaller wheels.
The ringing starts half a second after this ringing window is set up. One
round (two strokes) is rung before you can make any changes. This simulates
the time needed in a tower for the ringers to correct their striking.
A line of bell numbers is shown just below the bells. Click with the
<select> mouse button between the bells which you want to swap at the start
of the next handstroke. Only one click can be made at a time; this is all we
ever do in our tower.
After a change has been made, click over the word 'stand' to stop the
ringing. When all the graphics and sound have stopped you can click on the
'Close' icon in this ringing window.
Press <Escape> in an emergency and the ringing window will immediately
disappear.
The grey button at the bottom left in the main window, 'Replay', is used
to play it back after a composition has been made: first <select> 'Replay'
which puts a tick mark in the box, then click over 'Look To'.
If you have previously saved a composition to a file (see below) you can
play that one back by dragging its filer icon to the 'Call Changes' window
(or to the icon-bar icon). This overwrites any stored changes you may have
just made. The number of bells parameter will be changed to those used when
you saved the composition.
When replaying a composition, the bottom of the window has white background,
the first line has the number of stored changes and the second tries to
simulate the 'calls' made in the tower.
With 'Replay' selected the stored sequence will be followed;
with it unselected you are expected to compose your own sequence.
The button 'Save Changes' is initially 'greyed out', it can only be used
after you have made a composition with some changes; it will not save just
rounds. After ringing some changes, save your composition to a file by
clicking over 'Save Changes' to bring up a 'Save' window with a file icon
which can be dragged to a filer window in the usual way. Several
compositions are included in the directory 'Examples'.
The format of the saved file is described in Docs.DataFormat. It is a text
file which could be edited to make new compositions.