diff --git a/src/config.rs b/src/config.rs
index e9827c4..1681c7c 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -37,6 +37,14 @@ pub struct Device {
 #[derive(Serialize, Deserialize, Debug)]
 pub struct GUI {
    pub buttons: Buttons,
+   pub press: PreSufFix,
+   pub release: PreSufFix,
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct PreSufFix {
+   pub prefix: String,
+   pub suffix: String,
 }
 
 #[derive(Serialize, Deserialize, Debug)]
@@ -110,6 +118,14 @@ fn build_config_std() -> Config {
                      l: env::var("INPUT_GUI_BUTTON_L").unwrap_or(String::from("q")),
                      r: env::var("INPUT_GUI_BUTTON_R").unwrap_or(String::from("e")),
                   },
+                  press: PreSufFix{
+                     prefix: env::var("INPUT_GUI_PRESS_PREFIX").unwrap_or(String::from("")),
+                     suffix: env::var("INPUT_GUI_PRESS_SUFFIX").unwrap_or(String::from("")),
+                  },
+                  release: PreSufFix{
+                     prefix: env::var("INPUT_GUI_RELEASE_PREFIX").unwrap_or(String::from("!")),
+                     suffix: env::var("INPUT_GUI_RELEASE_SUFFIX").unwrap_or(String::from("")),
+                  },
                }),
                device: None,
                udp: Some(UDP{
diff --git a/src/gui.rs b/src/gui.rs
index dd466be..7843557 100644
--- a/src/gui.rs
+++ b/src/gui.rs
@@ -139,9 +139,15 @@ impl Application for Main {
             for key_code in self.keys_newly_down.iter() {
                match self.key_code_to_string(key_code) {
                   Some(x) => {
+                     for c in self.flags.cfg.press.prefix.chars() {
+                        s.push(c);
+                     }
                      for c in x.chars() {
                         s.push(c);
                      }
+                     for c in self.flags.cfg.press.suffix.chars() {
+                        s.push(c);
+                     }
                      self.keys_already_down.push(*key_code);
                   },
                   None => {},
@@ -157,8 +163,13 @@ impl Application for Main {
                match self.key_code_to_string(key_code) {
                   Some(x) => {
                      for c in x.chars() {
-                        s.push('!');
+                        for c in self.flags.cfg.release.prefix.chars() {
+                           s.push(c);
+                        }
                         s.push(c);
+                        for c in self.flags.cfg.release.suffix.chars() {
+                           s.push(c);
+                        }
                      }
                   },
                   None => {},
diff --git a/src/testdata/config-kinesis-to-kafka.json b/src/testdata/config-kinesis-to-kafka.json
index af334a1..103d300 100644
--- a/src/testdata/config-kinesis-to-kafka.json
+++ b/src/testdata/config-kinesis-to-kafka.json
@@ -1,6 +1,7 @@
 {
    "streams": {
       "input": {
+         "debug": true,
          "engine": {
             "name": "kinesis",
             "kinesis": {
@@ -10,6 +11,7 @@
          }
       },
       "output": {
+         "debug": true,
          "engine": {
             "name": "kafka",
             "kafka": {
diff --git a/src/testdata/config-stdin-to-stdout.yaml b/src/testdata/config-stdin-to-stdout.yaml
index 1ec2163..5d20d6b 100644
--- a/src/testdata/config-stdin-to-stdout.yaml
+++ b/src/testdata/config-stdin-to-stdout.yaml
@@ -1,7 +1,9 @@
 streams:
   input:
+    debug: true
     engine:
       name: stdin
   output:
+    debug: true
     engine:
       name: stdout