diff --git a/src/mixer.rs b/src/mixer.rs
index 51cb73cb..4f3241e8 100644
--- a/src/mixer.rs
+++ b/src/mixer.rs
@@ -110,35 +110,6 @@ impl Source for MixerSource {
         Err(SeekError::NotSupported {
             underlying_source: std::any::type_name::<Self>(),
         })
-
-        // uncomment when #510 is implemented (query position of playback)
-
-        // let mut org_positions = Vec::with_capacity(self.current_sources.len());
-        // let mut encounterd_err = None;
-        //
-        // for source in &mut self.current_sources {
-        //     let pos = /* source.playback_pos() */ todo!();
-        //     if let Err(e) = source.try_seek(pos) {
-        //         encounterd_err = Some(e);
-        //         break;
-        //     } else {
-        //         // store pos in case we need to roll back
-        //         org_positions.push(pos);
-        //     }
-        // }
-        //
-        // if let Some(e) = encounterd_err {
-        //     // rollback seeks that happend before err
-        //     for (pos, source) in org_positions
-        //         .into_iter()
-        //         .zip(self.current_sources.iter_mut())
-        //     {
-        //         source.try_seek(pos)?;
-        //     }
-        //     Err(e)
-        // } else {
-        //     Ok(())
-        // }
     }
 }
 
diff --git a/src/source/mix.rs b/src/source/mix.rs
index c5fedfb6..3778d8c5 100644
--- a/src/source/mix.rs
+++ b/src/source/mix.rs
@@ -117,18 +117,5 @@ where
         Err(SeekError::NotSupported {
             underlying_source: std::any::type_name::<Self>(),
         })
-
-        // uncomment when #510 is implemented (query position of playback)
-        // TODO use source_intact to check if rollback makes sense
-
-        // let org_pos = self.input1.playback_pos();
-        // self.input1.try_seek(pos)?;
-        //
-        // let res = self.input2.try_seek(pos);
-        // if res.is_err() { // rollback seek in input1
-        //     self.input1.try_seek(org_pos)?;
-        // }
-        //
-        // res
     }
 }