>>
-trackBchannelA = \relative c {
+trackBchannelA = \relative {
\voiceOne
\set Staff.instrumentName = ":1"
}
-trackBchannelB = \relative c {
+trackBchannelB = \relative {
\voiceThree
c''4. d8 e4 f
| % 2
}
-trackBchannelC = \relative c {
+trackBchannelC = \relative {
\voiceFour
d'1
| % 2
}
-trackBchannelD = \relative c {
+trackBchannelD = \relative {
\voiceTwo
c'4 c2 c4
| % 2