diff --git a/src/reskit/soundtrack/formats/dmf.rs b/src/reskit/soundtrack/formats/dmf.rs
index abc23b2..cc21ee2 100644
--- a/src/reskit/soundtrack/formats/dmf.rs
+++ b/src/reskit/soundtrack/formats/dmf.rs
@@ -3,7 +3,7 @@ use flate2::read::ZlibDecoder;
 use linked_hash_set::LinkedHashSet;
 use samplerate::convert;
 use uuid::Uuid;
-use crate::reskit::{utility::{get_string, get_u8, skip, get_u32, get_i8, get_i32, get_u16, get_i16, Ring, print_warning, print_info}, soundtrack::{types::{SampleFormat, PsgEnvelope, Note, Sample, PsgSettings, PatternRow, Effect, DcsgChannelMode, NoiseType, Channel}, engines::echo::{EchoFormat, EchoEvent, ESF_FM_1, ESF_FM_2, ESF_FM_3, ESF_FM_4, ESF_FM_5, ESF_PSG_1, ESF_FM_6, ESF_PSG_2, ESF_PSG_3, ESF_PSG_4, get_events_for_row, compact_delays}}};
+use crate::reskit::{utility::{get_string, get_u8, skip, get_u32, get_i8, get_i32, get_u16, get_i16, Ring, print_warning, print_info}, soundtrack::{types::{SampleFormat, PsgEnvelope, Note, Sample, PsgSettings, PatternRow, Effect, DcsgChannelMode, NoiseType, Channel, Instrument, InstrumentType, Fm2612Operator, Fm2612Settings}, engines::echo::{EchoFormat, EchoEvent, ESF_FM_1, ESF_FM_2, ESF_FM_3, ESF_FM_4, ESF_FM_5, ESF_PSG_1, ESF_FM_6, ESF_PSG_2, ESF_PSG_3, ESF_PSG_4, get_events_for_row, compact_delays}}};
 
 const DMF_MAGIC_NUMBER: &'static str = ".DelekDefleMask.";
 const DMF_SUPPORTED_VERSION: u8 = 27;
@@ -29,43 +29,6 @@ pub enum FrameMode {
     Custom( u8, u8, u8 )
 }
 
-#[derive(Debug, Default)]
-pub struct FmOperator {
-    am: u8,
-    ar: u8,
-    dr: u8,
-    mult: u8,
-    rr: u8,
-    sl: u8,
-    tl: u8,
-    dt2: u8,
-    rs: u8,
-    dt: i8,
-    d2r: u8,
-    ssg_mode: u8
-}
-
-#[derive(Debug)]
-pub struct FmSettings {
-    alg: u8,
-    fb: u8,
-    fms: u8,
-    ams: u8,
-    operators: [FmOperator; 4]
-}
-
-#[derive(Debug)]
-pub enum InstrumentType {
-    Fm( FmSettings ),
-    Psg( PsgSettings )
-}
-
-#[derive(Debug)]
-pub struct Instrument {
-    name: String,
-    instrument_type: InstrumentType
-}
-
 pub struct DmfModule {
     platform: u8,
     version: u8,
@@ -327,7 +290,7 @@ impl DmfModule {
                         }
                     };
 
-                    InstrumentType::Psg( PsgSettings { volume, arpeggio, noise, wavetable } )
+                    InstrumentType::PsgDcsg( PsgSettings { volume, arpeggio, noise, wavetable } )
                 },
                 1 => {
                     print_info( "Fm Instrument" );
@@ -342,11 +305,11 @@ impl DmfModule {
                     print_info( &format!( "FMS:\t{}", fms ) );
                     print_info( &format!( "AMS:\t{}", ams ) );
 
-                    let mut operators: [FmOperator; 4] = [
-                        FmOperator::default(),
-                        FmOperator::default(),
-                        FmOperator::default(),
-                        FmOperator::default()
+                    let mut operators: [Fm2612Operator; 4] = [
+                        Fm2612Operator::default(),
+                        Fm2612Operator::default(),
+                        Fm2612Operator::default(),
+                        Fm2612Operator::default()
                     ];
 
                     // Operator 1
@@ -465,12 +428,12 @@ impl DmfModule {
                         print_info( &format!( "Op 4 SSG_MODE:\t{}\n", operators[ 3 ].ssg_mode ) );
                     }
 
-                    InstrumentType::Fm( FmSettings { alg, fb, fms, ams, operators } )
+                    InstrumentType::Fm2612( Fm2612Settings { alg, fb, fms, ams, operators } )
                 },
                 _ => return Err( format!( "invalid file: invalid instrument mode {}", mode ) )?
             };
 
-            instruments.push( Instrument { name, instrument_type } );
+            instruments.push( Instrument { index: i as usize, name, instrument_type } );
         }
 
         // Version 27 of DMF specifies "1 wavetable of 0 bytes" for sega megadrive
@@ -672,7 +635,7 @@ impl EchoFormat for DmfModule {
         let mut eefs: HashMap<String, Vec<u8>> = HashMap::new();
 
         for instrument in &self.instruments {
-            if let InstrumentType::Psg( settings ) = &instrument.instrument_type {
+            if let InstrumentType::PsgDcsg( settings ) = &instrument.instrument_type {
                 // Echo uses volume and arpeggio envelopes
                 // Noise envelopes are usable but cannot be articulated in an instrument.
                 // For use of the noise envelope, use ESF $0Bnn/$3Bnn and $3Ann in the stream.
@@ -801,7 +764,7 @@ impl EchoFormat for DmfModule {
         let mut eifs: HashMap<String, Vec<u8>> = HashMap::new();
 
         for instrument in &self.instruments {
-            if let InstrumentType::Fm( settings ) = &instrument.instrument_type {
+            if let InstrumentType::Fm2612( settings ) = &instrument.instrument_type {
                 // Create feedback + algorithm byte
                 let alg_fb: u8 = ( settings.fb << 3 ) | settings.alg;
 
diff --git a/src/reskit/soundtrack/types.rs b/src/reskit/soundtrack/types.rs
index 4034e12..518c3fc 100644
--- a/src/reskit/soundtrack/types.rs
+++ b/src/reskit/soundtrack/types.rs
@@ -17,6 +17,44 @@ pub struct PsgSettings {
     pub wavetable: PsgEnvelope< u32 >
 }
 
+#[derive(Debug, Default)]
+pub struct Fm2612Operator {
+    pub am: u8,
+    pub ar: u8,
+    pub dr: u8,
+    pub mult: u8,
+    pub rr: u8,
+    pub sl: u8,
+    pub tl: u8,
+    pub dt2: u8,
+    pub rs: u8,
+    pub dt: i8,
+    pub d2r: u8,
+    pub ssg_mode: u8
+}
+
+#[derive(Debug)]
+pub struct Fm2612Settings {
+    pub alg: u8,
+    pub fb: u8,
+    pub fms: u8,
+    pub ams: u8,
+    pub operators: [Fm2612Operator; 4]
+}
+
+#[derive(Debug)]
+pub enum InstrumentType {
+    Fm2612( Fm2612Settings ),
+    PsgDcsg( PsgSettings )
+}
+
+#[derive(Debug)]
+pub struct Instrument {
+    pub index: usize,
+    pub name: String,
+    pub instrument_type: InstrumentType
+}
+
 #[derive(Debug)]
 pub enum SampleFormat {
     Bits8,