diff --git a/README.md b/README.md
index 919b6cc..da58369 100644
--- a/README.md
+++ b/README.md
@@ -29,4 +29,4 @@ what is supported, please visit the `SampleSoundfont` documentation in `core`.
 
 ## License
 
-XSynth is licensed under the MIT license.
+XSynth is licensed under the GNU Lesser General Public License 3.0.
diff --git a/core/src/channel_group/config.rs b/core/src/channel_group/config.rs
index fe1397b..4057891 100644
--- a/core/src/channel_group/config.rs
+++ b/core/src/channel_group/config.rs
@@ -6,7 +6,7 @@ use crate::{channel::ChannelInitOptions, AudioStreamParams};
 pub enum SynthFormat {
     /// Standard MIDI format with 16 channels. Channel 10 will be used for percussion.
     #[default]
-    MidiSingle,
+    Midi,
 
     /// Creates a custom number of channels with the default settings.
     Custom { channels: u32 },
@@ -83,6 +83,8 @@ pub struct ChannelGroupConfig {
 
     /// Defines the format that the synthesizer will use. See the `SynthFormat`
     /// documentation for more information.
+    ///
+    /// Default: `SynthFormat::Midi`
     pub format: SynthFormat,
 
     /// Parameters of the output audio.
diff --git a/core/src/channel_group/mod.rs b/core/src/channel_group/mod.rs
index 5f78a46..3b8ce65 100644
--- a/core/src/channel_group/mod.rs
+++ b/core/src/channel_group/mod.rs
@@ -60,7 +60,7 @@ impl ChannelGroup {
         };
 
         let channel_count = match config.format {
-            SynthFormat::MidiSingle => 16,
+            SynthFormat::Midi => 16,
             SynthFormat::Custom { channels } => channels,
         };
 
@@ -74,7 +74,7 @@ impl ChannelGroup {
             sample_cache_vecs.push(Vec::new());
         }
 
-        if config.format == SynthFormat::MidiSingle {
+        if config.format == SynthFormat::Midi {
             channels[9].push_events_iter(std::iter::once(ChannelEvent::Config(
                 ChannelConfigEvent::SetPercussionMode(true),
             )));
diff --git a/core/src/soundfont/config.rs b/core/src/soundfont/config.rs
index 265c004..079ac64 100644
--- a/core/src/soundfont/config.rs
+++ b/core/src/soundfont/config.rs
@@ -34,7 +34,7 @@ pub struct EnvelopeOptions {
     /// Controls the type of curve of the attack envelope stage. See the
     /// documentation of the `EnvelopeCurveType` enum for available options.
     ///
-    /// Default: `Convex`
+    /// Default: `Exponential`
     pub attack_curve: EnvelopeCurveType,
 
     /// Controls the type of curve of the decay envelope stage. See the
@@ -76,7 +76,7 @@ pub struct SoundfontInitOptions {
     /// Default: `None`
     pub preset: Option<u8>,
 
-    /// Configures the volume envelope curves in the dB scale. See the
+    /// Configures the volume envelope curves in dB units. See the
     /// documentation for `EnvelopeOptions` for more information.
     pub vol_envelope_options: EnvelopeOptions,
 
diff --git a/realtime/src/config.rs b/realtime/src/config.rs
index 4c2da1f..4cbb88a 100644
--- a/realtime/src/config.rs
+++ b/realtime/src/config.rs
@@ -1,5 +1,8 @@
 use std::ops::RangeInclusive;
-pub use xsynth_core::{channel::ChannelInitOptions, channel_group::ThreadCount};
+pub use xsynth_core::{
+    channel::ChannelInitOptions,
+    channel_group::{SynthFormat, ThreadCount},
+};
 
 /// Options for initializing a new RealtimeSynth.
 #[derive(Clone, Debug, PartialEq)]
@@ -14,12 +17,11 @@ pub struct XSynthRealtimeConfig {
     /// Default: `10.0`
     pub render_window_ms: f64,
 
-    /// Amount of VoiceChannel objects to be created (Number of MIDI channels).
-    /// The MIDI 1 spec uses 16 channels. If the channel count is 16 or
-    /// greater, then MIDI channel 10 will be set as the percussion channel.
+    /// Defines the format that the synthesizer will use. See the `SynthFormat`
+    /// documentation for more information.
     ///
-    /// Default: `16`
-    pub channel_count: u32,
+    /// Default: `SynthFormat::Midi`
+    pub format: SynthFormat,
 
     /// Controls the multithreading used for rendering per-voice audio for all
     /// the voices stored in a key for a channel. See the `ThreadCount` documentation
@@ -39,7 +41,7 @@ impl Default for XSynthRealtimeConfig {
         Self {
             channel_init_options: Default::default(),
             render_window_ms: 10.0,
-            channel_count: 16,
+            format: Default::default(),
             multithreading: ThreadCount::None,
             ignore_range: 0..=0,
         }
diff --git a/realtime/src/realtime_synth.rs b/realtime/src/realtime_synth.rs
index 5ff012b..06a01f0 100644
--- a/realtime/src/realtime_synth.rs
+++ b/realtime/src/realtime_synth.rs
@@ -16,6 +16,7 @@ use crossbeam_channel::{bounded, unbounded};
 use xsynth_core::{
     buffered_renderer::{BufferedRenderer, BufferedRendererStatsReader},
     channel::{ChannelConfigEvent, ChannelEvent, VoiceChannel},
+    channel_group::SynthFormat,
     effects::VolumeLimiter,
     helpers::{prepapre_cache_vec, sum_simd},
     AudioPipe, AudioStreamParams, FunctionAudioPipe,
@@ -148,11 +149,16 @@ impl RealtimeSynth {
             )),
         };
 
-        let (output_sender, output_receiver) = bounded::<Vec<f32>>(config.channel_count as usize);
+        let channel_count = match config.format {
+            SynthFormat::Midi => 16,
+            SynthFormat::Custom { channels } => channels,
+        };
+
+        let (output_sender, output_receiver) = bounded::<Vec<f32>>(channel_count as usize);
 
         let mut thread_handles = vec![];
 
-        for _ in 0u32..(config.channel_count) {
+        for _ in 0u32..channel_count {
             let mut channel =
                 VoiceChannel::new(config.channel_init_options, stream_params, pool.clone());
             let stats = channel.get_channel_stats();
@@ -183,7 +189,7 @@ impl RealtimeSynth {
             thread_handles.push(join_handle);
         }
 
-        if config.channel_count >= 16 {
+        if config.format == SynthFormat::Midi {
             senders[9]
                 .send(ChannelEvent::Config(ChannelConfigEvent::SetPercussionMode(
                     true,
@@ -192,7 +198,7 @@ impl RealtimeSynth {
         }
 
         let mut vec_cache: VecDeque<Vec<f32>> = VecDeque::new();
-        for _ in 0..(config.channel_count) {
+        for _ in 0..channel_count {
             vec_cache.push_front(Vec::new());
         }
 
@@ -200,7 +206,6 @@ impl RealtimeSynth {
 
         let total_voice_count = stats.voice_count.clone();
 
-        let channel_count = config.channel_count;
         let render = FunctionAudioPipe::new(stream_params, move |out| {
             for sender in command_senders.iter() {
                 let mut buf = vec_cache.pop_front().unwrap();
diff --git a/render/src/config.rs b/render/src/config.rs
index 5a16282..1aa7755 100644
--- a/render/src/config.rs
+++ b/render/src/config.rs
@@ -133,7 +133,7 @@ impl State {
                         .copied()
                         .unwrap_or(true),
                 },
-                format: SynthFormat::MidiSingle,
+                format: SynthFormat::Midi,
                 audio_params: AudioStreamParams::new(
                     matches.get_one("sample rate").copied().unwrap_or(48000),
                     matches