Listening - Bistow Doubles

This page contains a series of audio files generated from Abel, each ringing Bistow Doubles. There is a tenor behind, which should help in hearing where the start of each change is. Note that the treble is only ever in lead or 2nds place. The method is shown below:

1 2 3 4 5 6
2 1 4 3 5 6
2 1 3 4 5 6
1 2 4 3 5 6
1 4 2 5 3 6
4 1 5 2 3 6
4 1 2 5 3 6
1 4 5 2 3 6
1 5 4 3 2 6
5 1 3 4 2 6
5 1 4 3 2 6
1 5 3 4 2 6
1 3 5 2 4 6
3 1 2 5 4 6
3 1 5 2 4 6
1 3 2 5 4 6
1 2 3 4 5 6
Here is the plain course:

Now the treble will make some errors, although the initial rounds should be error-free, to establish the rhythm. Firstly, all the errors will be at both blows in 2nds place. A 100 millisecond error should be very easy to hear, but how small an error can you detect?

100ms early   100ms late
75ms early   75ms late
50ms early   50ms late
40ms early   40ms late
30ms early   30ms late
25ms early   25ms late
20ms early   20ms late

The rest of the samples use an error of 50 milliseconds.

Next listen to the leading. Here both blows are quick, or both blows are slow:

early   late

Now we have a combination of the above errors, with consistent mistakes in both leading and 2nds place:

early at lead
early in 2nds
  early at lead
late in 2nds
late at lead
early in 2nds
  late at lead
late in 2nds

Next you will hear consistent errors at either handstroke (in both lead and 2nds place) or at backstroke:

early at hand   late at hand
early at back   late at back

Finally, the following clips have consistent errors at just one blow:

early lead
handstroke
  late lead
handstroke
early lead
backstroke
  late lead
backstroke
early 2nds
handstroke
  late 2nds
handstroke
early 2nds
backstroke
  late 2nds
backstroke

Now time to test yourself. Which mistakes can you hear in each of these samples? All of them have appeared above.

A
B
C
D
E
F
G
H

The answers are here.

Please let me know if there are any mistakes above; it would be easily done with so many samples. Also, please let me know if there are any other listening exercises I can set up.

For an exercise on listening to Plain Hunt Doubles, see here.