with short settings, eg **X300**. *Single-shot* effects (**W0** to **W3**) need a longer period, eg **X1000**. Try changing the value after **X** in the program above to hear the difference. ### Tempo The speed (*tempo*) at which a piece of music is played can be set with the command **T** followed by the number of *crotchet beats per minute* (bpm) in the range **60** to **240**. The command controls the speed at which all notes are played, but can only be included in *channel* **A** of *PSG1* (the first string after the **PLAY** command) otherwise it is ignored, eg: ``` 10 a$="T180cdefg" 20 PLAY a$, "T120CDEFG" ``` will play *octave chords* but at **180bpm** as the second setting is ignored. If no *tempo* is specified, the music will be played at **120 bpm**. ### Repeated phrases Any musical phrase can be repeated by enclosing the appropriate string or part of a string in parentheses. For example: ``` 10 PLAY "abC(DEFG)" ``` will repeat the last four notes. If there is an unequal number of parentheses, the phrase will be repeated back to the last parenthesis. If there is only a closing parenthesis, the phrase will be repeated back to the beginning of the string. As an example: ``` 10 PLAY "abCDEFG)" ``` will repeat all seven notes. Double closing parentheses: ``` 10 PLAY "O2CEGA))" ``` will cause an *infinite* repeat. This is particularly useful for things like repetitive bass lines. To turn off an *infinite* repeat you will need to use the **H** command. | Effect Value | Visual Representation | Description | |---|---|---| | 0 |  | Decay then stop | | 1 |  | Attack then stop | | 2 |  | Decay then hold | | 3 |  | Attack then hold | | 4 |  | Repeated Decay | | 5 |  | Repeated Attack | | 6 |  | Repeated Attack-Decay | | 7 |  | Repeated Decay-Attack | *Table 12 – Volume effects values*