Staff.midiMaximumVolume and drums

[Daniel MALIK]

i try this code for a midi file with drums with a volume low

\score {
       <<
       \new Staff {
                \set Staff.midiMaximumVolume = #1
               \NOTES
               }
              
       \new Staff {
                \set  = #0.1
               \drums {
                        \repeat "unfold" 98 {  toml2 ss2 ss2 ss2}
                      
               }
       }
       >>
       \midi { }
                      
}

if the is 0.1 or 0.9 the volume is the same !
lilipond 2.12.0

Thanks for replay
D M