diff --git a/doc/4-instrument/fm-esfm.md b/doc/4-instrument/fm-esfm.md
index c71ee43dd..147d3f948 100644
--- a/doc/4-instrument/fm-esfm.md
+++ b/doc/4-instrument/fm-esfm.md
@@ -49,7 +49,7 @@ these apply to each operator:
 ![FM ADSR chart](FM-ADSRchart.png)
 
 - **Key Scale Rate (KSR)**: also known as "Rate Scale". determines the degree to which the envelope execution speed increases according to the pitch.
-- **Frequency Multiplier (MULT)**: sets the coarse pitch offset in relation to the note (0 to 15). the values follow the harmonic scale. For example, 0 is -1 octave, 1 is 0 octaves, 2 is 1 octave, 3 is 1 octave 7 semitones, and so on.
+- **Frequency Multiplier (MULT)**: sets the coarse pitch offset in relation to the note (0 to 15). the values follow the harmonic scale. for example, 0 is -1 octave, 1 is 0 octaves, 2 is 1 octave, 3 is 1 octave 7 semitones, and so on.
   - note that values 11, 13 and 14 behave as 10, 12 and 15 respectively.
 - **Tune (CT)**: sets the semitone offset in relation to the note (-24 to 24).
   - this is a software effect.
diff --git a/doc/4-instrument/fm-opl.md b/doc/4-instrument/fm-opl.md
index b60850ada..0f16346ce 100644
--- a/doc/4-instrument/fm-opl.md
+++ b/doc/4-instrument/fm-opl.md
@@ -40,7 +40,7 @@ these apply to each operator:
 ![FM ADSR chart](FM-ADSRchart.png)
 
 - **Key Scale Rate (KSR)**: also known as "Rate Scale". determines the degree to which the envelope execution speed increases according to the pitch.
-- **Frequency Multiplier (MULT)**: sets the coarse pitch offset in relation to the note (0 to 15). the values follow the harmonic scale. For example, 0 is -1 octave, 1 is 0 octaves, 2 is 1 octave, 3 is 1 octave 7 semitones, and so on.
+- **Frequency Multiplier (MULT)**: sets the coarse pitch offset in relation to the note (0 to 15). the values follow the harmonic scale. for example, 0 is -1 octave, 1 is 0 octaves, 2 is 1 octave, 3 is 1 octave 7 semitones, and so on.
   - note that values 11, 13 and 14 behave as 10, 12 and 12 respectively.
 - **Waveform Select (WS)**: changes the waveform of the operator (OPL2 and OPL3 only, 0-3 range on OPL2 and 0-7 on OPL3).
 - **Vibrato (VIB)**: makes the operator affected by LFO vibrato.
diff --git a/doc/4-instrument/fm-opll.md b/doc/4-instrument/fm-opll.md
index 3fe9aabad..902c65812 100644
--- a/doc/4-instrument/fm-opll.md
+++ b/doc/4-instrument/fm-opll.md
@@ -43,7 +43,7 @@ these apply to each operator:
 ![FM ADSR chart](FM-ADSRchart.png)
 
 - **Envelope Scale (KSR)**: also known as "Key Scale". determines the degree to which the envelope execution speed increases according to the pitch.
-- **Frequency Multiplier (MULT)**: sets the coarse pitch offset in relation to the note (0 to 15). the values follow the harmonic scale. For example, 0 is -1 octave, 1 is 0 octaves, 2 is 1 octave, 3 is 1 octave 7 semitones, and so on.
+- **Frequency Multiplier (MULT)**: sets the coarse pitch offset in relation to the note (0 to 15). the values follow the harmonic scale. for example, 0 is -1 octave, 1 is 0 octaves, 2 is 1 octave, 3 is 1 octave 7 semitones, and so on.
   - note that values 11, 13 and 14 behave as 10, 12 and 12 respectively.
 - **Vibrato (VIB)**: makes the operator affected by LFO vibrato.
 
diff --git a/doc/4-instrument/fm-opm.md b/doc/4-instrument/fm-opm.md
index f2ef32d3d..590c7b1aa 100644
--- a/doc/4-instrument/fm-opm.md
+++ b/doc/4-instrument/fm-opm.md
@@ -41,7 +41,7 @@ these apply to each operator:
 ![FM ADSR chart](FM-ADSRchart.png)
 
 - **Envelope Scale (RS/KS)**: also known as "Key Scale" or "Rate Scale". determines the degree to which the envelope execution speed increases according to the pitch (0 to 3).
-- **Frequency Multiplier (MULT)**: sets the coarse pitch offset in relation to the note (0 to 15). the values follow the harmonic scale. For example, 0 is -1 octave, 1 is 0 octaves, 2 is 1 octave, 3 is 1 octave 7 semitones, and so on.
+- **Frequency Multiplier (MULT)**: sets the coarse pitch offset in relation to the note (0 to 15). the values follow the harmonic scale. for example, 0 is -1 octave, 1 is 0 octaves, 2 is 1 octave, 3 is 1 octave 7 semitones, and so on.
 - **Fine Detune (DT)**: shifts the pitch a little (0 to 7).
 - **Coarse Detune (DT2)**: shifts the pitch by tens of cents (0 to 3).
 
diff --git a/doc/4-instrument/fm-opn.md b/doc/4-instrument/fm-opn.md
index e3c07e6d6..7e294c267 100644
--- a/doc/4-instrument/fm-opn.md
+++ b/doc/4-instrument/fm-opn.md
@@ -44,7 +44,7 @@ these apply to each operator:
 ![FM ADSR chart](FM-ADSRchart.png)
 
 - **Envelope Scale (RS/KS)**: also known as "Key Scale" or "Rate Scale". determines the degree to which the envelope execution speed increases according to the pitch (0 to 3).
-- **Frequency Multiplier (MULT)**: sets the coarse pitch offset in relation to the note (0 to 15). the values follow the harmonic scale. For example, 0 is -1 octave, 1 is 0 octaves, 2 is 1 octave, 3 is 1 octave 7 semitones, and so on.
+- **Frequency Multiplier (MULT)**: sets the coarse pitch offset in relation to the note (0 to 15). the values follow the harmonic scale. for example, 0 is -1 octave, 1 is 0 octaves, 2 is 1 octave, 3 is 1 octave 7 semitones, and so on.
 - **Fine Detune (DT)**: shifts the pitch a little (0 to 7).
 
 
diff --git a/doc/4-instrument/fm-opz.md b/doc/4-instrument/fm-opz.md
index d176e8c51..ef6b8487c 100644
--- a/doc/4-instrument/fm-opz.md
+++ b/doc/4-instrument/fm-opz.md
@@ -43,7 +43,7 @@ these apply to each operator:
 ![FM ADSR chart](FM-ADSRchart.png)
 
 - **Envelope Scale (RS/KS)**: also known as "Rate Scale" or "Key Scale". determines the degree to which the envelope execution speed increases according to the pitch (0 to 3).
-- **Frequency Multiplier (MULT)**: sets the coarse pitch offset in relation to the note (0 to 15). the values follow the harmonic scale. For example, 0 is -1 octave, 1 is 0 octaves, 2 is 1 octave, 3 is 1 octave 7 semitones, and so on.
+- **Frequency Multiplier (MULT)**: sets the coarse pitch offset in relation to the note (0 to 15). the values follow the harmonic scale. for example, 0 is -1 octave, 1 is 0 octaves, 2 is 1 octave, 3 is 1 octave 7 semitones, and so on.
 - **Fine Frequency Multiplier (Fine)**: a fine control for MULT.
 - **Envelope Generator Shift (EGS)**: adds a "handicap" to the envelope. in other words, the minimum volume of the operator.
   - 0: no change