for ch in 0..self.mode.get_channels() {
let off = abuf.get_offset(ch + self.start_ch);
let mut adata = abuf.get_abuf_f32().unwrap();
for ch in 0..self.mode.get_channels() {
let off = abuf.get_offset(ch + self.start_ch);
let mut adata = abuf.get_abuf_f32().unwrap();